See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/I1.001.pdf
The concept of laser plasma accelerators has been proposed by T. Tajima and Dawson in 1979. Through nonlinear theory and PIC simulations it was shown than GV/cm accelerating field should be produced when intense laser pulse interacts with an underdense plasma in the laser wakefield or in laser beat-wave regime. Since...
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http://ocs.ciemat.es/EPS2019ABS/pdf/I1.003.pdf
The newly developed Terrestrial Reconnection Experiment (TREX) [1] in the Wisconsin Plasma Physics Laboratory (WiPPL) [2] is optimized to study magnetic reconnection in a regime where Coulomb collisions between electrons and ions are sufficiently infrequent that kinetic effects in the electron dynamics are retained...
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http://ocs.ciemat.es/EPS2019ABS/pdf/I1.004.pdf
Atmospheric pressure non-equilibrium plasmas are effective source of large densities of reactive radicals, metastables and ions and also high fluxes of photons with wavelengths down to the vacuum UV range. The resulting high reactivity of these APPs can be used in many surface treatment applications such as activation...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1001.pdf
Ion cyclotron emission (ICE) in tokamak plasmas has recently become a subject of enhanced interest due to their potent capability to be used as a diagnostic tool for fast ion and charged fusion product confinement characterization. At the TUMAN-3M tokamak, ICE is observed both in ohmic and NBI heated plasma. In...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1004.pdf
Axis-symmetric magnetic traps have been used for decades asion sourcesfor accelerators. Recent searches, however, revealed that plasma generated in compact traps is also a surprising environment for studies of nuclear astrophysics, includingnuclear beta-decays andplasma instabilities connected to ...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1006.pdf
Considerable interest in radial fluctuations of plasma velocity is associated with their significant role in the formation of turbulent radial flows. In this paper we implement the new microwave technique - the equatorial enhanced scattering (EES) [1], possessing the submillimetre spatial radial resolution and...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1007.pdf
The growing capabilities (speed, sensitivity, dynamic range) of fast visible cameras make this tool more and more interesting for diagnosing turbulence in plasma devices, and in particular,
in fusion ones. Especially, cameras' speed is approaching probe acquisition frequencies while they usually reach higher spatial...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1009.pdf
The JT-60SA tokamak will be able to operate in scenarios with large fraction of fast-ion pressure. The fast-ion population with supra-alfvenic velocities is expected to play an important role in the stability of magnetohydrodynamic (MHD) fluctuations, in particular of the Alfven Eigenmodes (AEs). Direct wave-particle...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1012.pdf
JT-60SA is a fusion experiment designed to support the operation of ITER and to investigate how best to optimize the operation of future fusion power plants. For the safe operation of the device, a survey spectrometer observing the plasma from an equatorial port is foreseen to monitor light impurities such as carbon...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1015.pdf
The production of relativistic runaway electrons during disruptions can potentially compromise the integrity of plasma-facing-components in large tokamaks. In ITER up to 70% of the initial plasma current can be converted into relativistic runaway current. The energy content of such runaway electron beam can reach...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1017.pdf
A new diagnostic - the imaging heavy ion beam probe (i-HIBP) [1] - for the simultaneous measurement of plasma potential, magnetic field and density fluctuations is being developed at the ASDEX Upgrade tokamak. A neutral beam of heavy atoms is injected into the plasma at energies around 70 keV. As the neutral primary...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1018.pdf
Experimental investigation of magnetised plasma turbulence is actively pursued in fusion aimed as well as in basic plasma physics toroidal devices. In particular the understanding of turbulent transport mechanisms has a great interest for the improvement of the magnetic confinement. Here we discuss the use of...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1021.pdf
This work discusses first results of ne and Te measurements on Globus-M2 obtained with the upgraded Thomson scattering (TS) diagnostics. Globus-M2 is spherical tokamak with the following parameters R = 0.36m, r = 0.24m, Ip < 500 kA which differs from Globus-M by a two times higher magnetic field reaching 1 T. The...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1023.pdf
Turbulent transport plays a key role in plasma confinement, which makes understanding and control of plasma turbulence one of the major goals of fusion research. The tools for turbulence characterization include Doppler reflectometry (DR) and radial correlation Doppler reflectometry (RCDR) [1], latter of which...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1024.pdf
In magnetic fusion devices, unstable Alfvén eigenmodes (AEs) may lead to frequency sweeping events and enhanced particle transport. Refs. [1, 2] explain the frequency sweeping events in terms of evolution of coherent structures, namely holes and clumps, in the energetic particles (EPs) phase-space using a perturbative...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1027.pdf
Alpha channelling is a mechanism to transfer the power associated with the fusion-generated alpha particles to the thermal ions through the interaction with an externally excited Ion Bernstein Wave (IBW) that absorbs the alpha particle energy associated with the perpendicular motion. The extraction of energy is...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1031.pdf
Tokamak high-confinement regimes are normally affected by the presence of often violent edge localised modes (ELMs). ELMs deposit unacceptable peak heat loads causing a severe deterioration of the plasma facing components. Thus a vivid interest has arisen on the development of naturally ELM-free regimes. One of the...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1035.pdf
Non-linear MHD simulations of pellet-triggered ELMs in JET plasma have been carried out with the JOREK code [1, 2, 3]. The pellet particle fueling efficiency and the power flux at the divertor target during the pellet-triggered ELM have been studied. The understanding of the ELM mitigation is more important in the...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1037.pdf
The ideal evolution equation, ∂B/∂t =curl×(u⊥×B),implies magnetic field lines move with a velocity u⊥and cannot change their connections. Nevertheless, for an electric field that is arbitrarily close to the ideal form, E +u⊥×B= -grad Φ,magnetic connections will in general break on a time scale τ, where...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1038 .pdf
Helical magnetic field devices, such as the Helimak (University of Texas) and TORPEX (EPFL), provide a useful environment for refining our understanding of open fieldline toroidal systems and testing both new and old codes. These devices have important ingredients of tokamak scrape-off-layer turbulence: parallel...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1040.pdf
Magnetic equilibria are fundamental to almost every phenomena in tokamak plasmas, but accurate numerical solutions of the Grad-Shafranov (GS) equation are not always the best tool to gain insight into such complex processes. Simplified local descriptions, like the s - alpha model with circular magnetic surfaces [1] or...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1041.pdf
Disruption prediction and avoidance is critical in ITER and reactor-scale tokamaks to maintain steady plasma operation and to avoid damage to device components. The present status and results from the physics-based disruption event characterization and forecasting (DECAF) research effort are shown for multiple tokamak...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1042.pdf
Development of the arc discharges in the peripheral plasma is considered as a possible mechanism determining transition from relatively slow growth of the large-scale MHD perturbations to thermal quench (minor disruption) and subsequent transition to a major disruption (current collapse). Development of the arc...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1045.pdf
Detailed properties of the 3D structure of (1/1) internal kinks can be accessed using a modern suite of spectroscopic imaging diagnostics. A combination of high time- and space-resolved 1D measurements of electron density and temperature fluctuations together with local 2D soft x-ray (SXR) radiated power density...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1047.pdf
At present, the intensive experimental and theoretical studies of Edge Localized Modes (ELMs) physics are particularly oriented towards finding the methods of their control in ITER. ELMs potentially represent an issue for ITER divertor lifetime due to large transient heat and particle losses released in each ELM...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1048.pdf
The Reversed Field Pinch (RFP) configuration is often characterized by a wide spectrum of unstable tearing modes (TMs) involved in the generation and sustainment of the magnetic field in the plasma. This dynamo process is heavily influenced also by other processes or parameters like intrinsic plasma flow (no external...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1049.pdf
The reversed-field pinch (RFP) is a configuration for the magnetic confinement of fusion plasmas, in which most of the toroidal field is generated by the plasma itself through a self-organized dynamo process, instead of being produced by external coils as in the tokamak. In the RFP, the nonlinear saturation of...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1051.pdf
Quiescent H-mode (QH-mode) operation is highly desirable relative to the well known Hmode operation because it allows for high energy density in the core as well as potentially improved confinement of energy and particles. A feature of QH-mode is that the Edge Localized Mode (ELM) instabilities are replaced with...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1052.pdf
A four-terminal electrical network formulation for the Reversed Field Pinch (RFP) is derived, fixing the flaws of the similar models available in the past literature [1][2]. The approach used in those papers starts from a specific plasma description, and the four electrical quantities of interest (toroidal loop...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1056.pdf
An n = 1 locked, or slowly rotating, mode has been observed in most pulses prior to JET disruptions. However, a small fraction of non-disruptive pulses has a locked mode which eventually vanishes without disruption. Despite these exceptions the locked mode amplitude is routinely used as a trigger for the JET...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1059.pdf
ITER plasmas will be characterized by a high density plasma (i.e. Greenwald fraction) at low collisionality inside the separatrix, a high density in the scrape-off layer combined with a high recycling detached divertor. ELMs in ITER are expected to be tolerable at low plasma current but need to be controlled at the...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1064.pdf
It is highly desirable to find a common regime of validity for gyrokinetic and Braginskii fluid codes, which would give us a handle to extend the regime of validity of either to the very edge and H-mode transition conditions. Up to now the highly nonlinear conditions there are more naturally the domain of fluid codes,...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1065.pdf
We construct fluid plasma models that combine physical consistency and numerical stability with a simple and flexible implementation [1]. This is achieved by exploiting the anti-symmetric property of the plasma flow operator, ∫dVφ(∇·v+v·∇)ψ=−∫dVψ(∇·v+v·∇)φ, which results in exact conservation. Since this expression...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1066.pdf
The heavy ions quasicontinuum (in the 4-8 nm spectral range) presently was observed on many modern thermonuclear installations. In particular it could be used for monitoring the tungsten transport. The statistical modeling of heavy ions is proposed to describe general features of these spectra. It considers the ions...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1067.pdf
A joint experimental/theoretical investigation on the characteristics of plasmas produced in GyM magnetic linear device [1] has been carried out, comparing the measured electron energy distribution function (EEDF) with the distribution resulting from a self-consistent state-to-state kinetic model coupling the...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1070.pdf
Type I-ELM heat loads are of great concern for ITER and future power plants as they can lead to divertor erosion and melting. Investigation of the nonlinear ELM phase and its dynamics is indispensable for progress on ELM control and understanding. An additional driver providing explosive growth in the nonlinear ELM...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1071.pdf
Recent modelling and experimental studies [1-4] show that the edge density fluctuations can affect the electron cyclotron (EC) wave propagation in a tokamak plasma. In particular, the presence of density fluctuations in the scrape-off layer (SOL) can modify the EC beam propagation causing a power deposition...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1073.pdf
Negative ion sources are a critical component of neutral beam injectors NBI (used for stellarator and tokamak heating and current drive), due to the stringent requirement current density, beam divergence and operational stability. In support to the NBI development, a relatively compact 9 beamlet H- source (named...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1075.pdf
Parametric decay instabilities (PDIs) are phenomena in which a large-amplitude pump wave decays to two lower-frequency daughter waves once its amplitude exceeds a nonlinear threshold. PDIs are ubiquitous in situations where plasmas interact with strong waves, including ionospheric modification experiments and wave...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1076.pdf
In the recent experimental campaign of W7-X, a neutral beam injection (NBI) system was put into operation for the first time. This system is in many parts identical to the system on AUG. It consists of two injectors, NI21 and NI20, that can accommodate up to four radio-frequency driven ion sources. The acceleration...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1077.pdf
An efficient fuelling capability is mandatory for large fusion devices; this being of primary importance for helical devices [1]. The injection of cryogenic pellets is the best candidate to refuel the plasma core in large devices. During the past decades pellet injection (PI) technologies have become well developed...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1078.pdf
Two high-power systems for non-inductive current drive in the mid-radius region with waves in the lower hybrid range of frequencies (LHRF) are under construction for the DIII-D tokamak. One system will launch fast waves at 0.48 GHz ('helicons') from a 30-element traveling wave antenna of the comb-line type mounted...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1080.pdf
High field side lower hybrid current drive (HFS LHCD) has potential to provide efficient off-axis current drive consistent with advanced tokamak (AT) scenarios via improved wave accessibility and penetration.[1] Due to the quiescent HFS scrape off layer, HFS LHCD has potentially dramatically reduced plasma material...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1081.pdf
Multi-tokamak analysis and modelling is performed within the EUROfusion Integrated Modelling (EU-IM) framework [1], backbone to the Integrated Modelling and Analysis Suite (IMAS)[2], which offer unique capabilities by providing device agnostic integrated simulation workflows, encompassing interchangeable physics...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1082.pdf
One of the main goals of Wendelstein 7-X is to show that stellarators can sustain fusion-relevant plasma conditions in steady-state. It is envisaged to demonstrate plasma operation with a density well above 10^20/m^3, central electron and ion temperatures around 3 keV and a pulse length of half an hour. Finding a...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1084.pdf
One of the most fundamental control problems arising in ITER and future burning-plasma tokamaks is the regulation of the plasma temperature and density to produce a determined amount of fusion power while avoiding undesired transients. ITER is designed to achieve a ratio of fusion power to auxiliary power, Q, of 10....
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1088.pdf
It is shown that stochastic edge magnetic field topology with applied resonant magnetic perturbations can explain the increased L-H power threshold with applied n=2 resonant magnetic perturbations (RMP) in low rotation, ITER-similar-shape plasmas in DIII-D (<ne>=1.5-5x10^19m^-3, Bt=1.9-2T, Ip=1.5 MA, q95~3.6). With...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1089.pdf
Accurate prediction of turbulent transport is essential for interpretation of current-day fusion experiments, designing future devices, and optimization of plasma scenarios. Turbulent transport in the core of the plasma is well-described by quasilinear theory, which can be leveraged to create reduced models. These...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1091.pdf
Existing methods for diagnostics and control are still insufficient to deal with the various kinds of instabilities and collective dynamics that occur in magnetically confined fusion plasmas, which may impact the missions of the ITER and DEMO projects. Using small-scale laser experiments on the J-KAREN-P laser at...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1092.pdf
HYMAGYC [1] is a HYbrid MAgnetohydrodynamycs GYrokinetic Code suitable to study the interaction between energetic particles (EPs) and Alfvénic modes. Thermal plasma is described as a single fluid by fully resistive linear MHD equations, while EPs are described by nonlinear gyrokinetic Vlasov equations [2]. In this...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1094.pdf
Measurements and modeling of DIII-D low collisionality (v*e~0.1-0.3) plasmas reveal pedestal-top locked modes as the probable trigger for Edge-Localized-Mode (ELM) suppression by n=2 and n=3 Resonant Magnetic Perturbations (RMPs) in a range of plasma conditions including neutral beam torque 3 - 6 Nm, plasma average...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1095.pdf
The resonant detection and measurement of the damping rates of Alfvén Eigenmodes (AEs) is of critical importance to the design of experiments and development of models of AE stability [1]. With the Alfvén Eigenmodes Active Diagnostic (AEAD) on JET, weakly-damped Toroidal AEs (TAEs) have been probed. Theoretical...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1096.pdf
The sideways forces acting on the conducting wall due to the n=1 kink instability are investigated. During the early phase of the disruption the plasma is considered to be isolated from the wall and halo currents do not appear. The plasma with minor radius of 1 m and almost circular shape with a large current (> 5...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1097.pdf
Large-scale fusion reactors like ITER are going to require very high-energy neutral beams (>1MeV) for plasma heating purposes as well as diagnostic neutral beams. To realize this, negative ion sources are a better alternative to the conventional positive ion sources because of their higher efficiency of...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1100.pdf
Adjustable current and q-profile shapes are of particular interest for the development of advanced scenarios, e.g., non-inductive tokamak operation, and for testing and refining of transport models for predictive capabilities. The current profile is tailored at ASDEX Upgrade using improved heating and current-drive...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1101.pdf
It has recently been demonstrated that the injection of cryogenic pellets into a magnetically confined plasma is accompanied by a considerable transfer of thermal energy from the electrons of the background plasma to the ions [1]. This is the result of the ambipolar expansion along the magnetic field line of the cold...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1102.pdf
Detailed numerical studies of single neon pellets and multiple pellet fragments have been performed in support of the shattered pellet injection (SPI) concept for the plasma disruption mitigation system [1].
Two codes have been developed to study details of the evolution and properties of ablation clouds in the...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1103.pdf
The concept of alpha power channeling has been proposed by N. Fisch and collaborators as an efficient tool to improve the performance of fusion reactors, delivering the fusion alpha power into radio frequency waves, which are absorbed by ion species [1]. Alpha channeling by Doppler-shifted inverse nonlinear Landau...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1104.pdf
We study tokamak fuelling by using a first-principles approach, based on turbulent numerical simulations of the plasma periphery. These simulations are carried out by using the GBS code [1, 2]. GBS is a 3D flux-driven turbulence code that advances the drift-reduced two-fluid Braginskii equations, while solving a...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2005.pdf
We study short-lived plasma flows during sub-microsecond Z-pinch implosion by high current facility. To fulfil multiparametric numerical simulations we use radiativemagnetohydrodynamics (RMHD) code MARPLE-3D developed in Keldysh Institute of Applied Mathematics. MARPLE is designed as an expandable full-scale...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2006.pdf
Laser electron accelerators are considered as a novel high brightness x-ray source with unprecedented features such as small size and narrow divergence. These advantages make this source a promising diagnostic for variety of applications especially in radiography. For the most future applications it is necessary to...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2009.pdf
The production of laser driven protons has attracted a large number of studies thanks to their potential applications such as isochoric heating, proton radiography, isotope production or proton therapy [1]. The Target Normal Sheath Acceleration (TNSA) is the most robust and well-known generating process but it...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2010.pdf
Kinetic shocks in laser-plasmas provide a promising acceleration scheme to produce highly mono-energetic ion beams [1, 2, 3]. The modeling of such setups often neglects Coulomb collisions due to the short time scales of the kinetic processes involved. However, previous results suggest at that collisions might...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2011.pdf
The purpose of this research is to develop a compact neutron source. Neutron can be generated by a nuclear fusion reaction. Inertia electrostatic confinement fusion (IECF) is one of the compact neutron sources by using a nuclear fusion reaction. Characteristics of the IECF are compact, monochromatic energy (2.45 MeV...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2012.pdf
The laser plasma undulator is a tunable device which utilizes laser plasma interaction to function as a short period undulator. Such an undulator could provide a table top solution for the production of X-ray beams which could be utilized in laboratories and medicine. In the regime of linear laser plasma interaction,...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2015.pdf
We discuss a new method to generate few-cycle pulses from ionization of a medium by twocolor (or, more generally, multicolor) femtosecond fields [1, 2]. The method is based on the parametric excitation of a free-electron nonlinear current at the combination frequencies of ionizing pulses. In contrast to the common...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2018.pdf
Analytical theory of harmonic generation in an inhomogeneous laser-produced plasma based on the relativistic plasma resonance mechanism [1] is presented. This theory applies renormgroup symmetries method and advances known approaches beyond their applicability conditions. Relativistically strong electric fields and...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2019.pdf
Short laser pulse interaction with a rather dense gas plasma target may result in pulse propagation regime which maximize the charge of the high-energy electron bunches. This regime corresponds to laser pulse propagation in a self-trapping mode, where the diffraction divergence is balanced by the relativistic...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2021.pdf
With the appearance of recent X-ray free electron lasers (FEL) [1], the stimulated bremsstrahlung (SB) process of electrons on plasma ions' scattering centres may provide a sufficient energy for plasma heating at the absorption even one-two photons [2], which makes the SB as one of the effective mechanisms for laser...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2022.pdf
We show that the proper choice of canonical variables and effective time, such that the new Hamiltonian is conserved for electrons in a dominant laser field, greatly simplifies analytical treatment of the problem. For example, for the case of counter propagating planar laser beams and dominant laser with relativistic...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2023.pdf
One of the effects accompanying laser-target interactions at high laser intensities is the generation of strong electromagnetic pulses (EMP) with frequencies in the range of tens of MHz to few GHz. Such pulses may interfere with the electronics of the data acquisition systems and pose a threat to the safe and...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2024.pdf
Electromagnetic waves, while propagating through a vacuum, can carry orbital angular momentum [1] this is used in a variety of applications[2, 3]. In this study Langmuir waves carrying finite orbital angular moment are examined within a revised paraxial optics approximation. While Laguerre-Gaussian modes appear to be...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3001.pdf
The original approach to use Hall-type plasma accelerators with closed electron drift and open walls for production converging towards axis accelerating ion beam describes here. The model in which a generalization condition of self-sustained discharge in crossed ExH fields with taking into consideration both electron...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3002.pdf
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3003.pdf
Nowadays capillary discharge is considered as the main way to create compact sources of EUV and soft X-ray radiation. Radiation in this range with such discharge is generated at the stage of magnetic plasma compression, when the current flowing through the system reaches values of the order of several kiloamperes....
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3004.pdf
Dusty plasmas with nanoparticles have attracted increased attention in the last few years. In comparison to the existing experimental setups with nanoparticles grown in the rf discharge, we present the insertion of industrial, nanoscaled Al2O3 dust with a gas jet injection setup. Beside the insertion, the...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3005.pdf
The charge of microparticles immersed into the dc discharge of PK-4 experimental facility was estimated using the particle velocities from the experiments performed on Earth and under microgravity conditions on the International Space Station (ISS). PK-4 is an experimental laboratory developed to provide a range of...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3006.pdf
Pulsed plasma jets are often used in various technical and scientific applications and can be formed by using a capillary discharge with an evaporating wall (CDEW) [1-10]. The CDEW is a powerful pulsed plasma-dynamic discharge whose plasma is created in a dielectric cylindrical channel filled to facilitate electrical...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3008.pdf
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3009.pdf
The microwave plasma torch represents a class of plasma generators, important for their applications. In cases, where ethanol (typical carbon structures growth precursor) is admixed to the working gas, the environment becomes dusty, which brings known problems with plasma diagnostics (e.g. electron density cannot be...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3010.pdf
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3011.pdf
High-density compressed plasma flows have many applications in the field of plasma-surface interaction [1, 2]. Additionally, magnetoplasma compressors (MPCs) are among the most commonly investigated types of possible technological sources of extreme ultraviolet (EUV) radiation [3]. Previous experimental findings have...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3013.pdf
Dielectric plasma discharge is used as a plasma reactor for surface modification, sterilization, germination, and ozone generation. The importance thing is plasma power controlling that is done by several ways such as voltage, frequency and pulse density of applying signal for plasma electrodes. This research is...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3016.pdf
The elementary processes in plasma have received considerable attention in many areas of physics such as astrophysics, atmospheric science, atomic physics, molecular physics, plasma physics, and surface sciences since the excitation and ionization of atoms and molecules have provided useful structural information on...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3017.pdf
Saint Elmo's fire and lightning are two known forms of naturally occurring atmospheric pressure plasmas. As a technology, non-thermal plasmas are induced from artificially created electromagnetic or electrostatic fields. Here we report the observation of arguably a new case of a naturally formed such plasma, created...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3019.pdf
Laser-induced discharge within a vacuum gap of few millimeters between electrodes is experimentally studied. The discharge is triggered by 1064 nm Nd:YAG laser pulses with intensities varied from 10^7 W/cm^2 to 10^9 W/cm^2 on the surface of titanium target electrode. The current formation time dependences from both...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3020.pdf
Microwave Pulse Compressor (MPC) is an high power microwave device designed for generation of 100's of MW's thru amplification. The amplification is based upon time compression of an initial Microwave (RF) pulse characterized by a long (µsec) duration to a short (ns) output pulse, ideally increasing the RF power by...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.4001.pdf
Gyrokinetic stability of plasmas in a Z-pinch magnetic geometry is studied numerically using the GENE code [1] with a particular focus on the behaviour of "pair plasmas" consisting of positrons and electrons. Importantly, the simulations presented here are potentially applicable to dipole systems such as the upcoming...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.4002.pdf
Since more than three decades, numerical simulations of fusion plasmas have undergone significant development. Nowadays, access to the High-Performance Computing facilities allows one to model realistic plasma scenarios. The questions perhaps remain open about verification and validity of the results obtained from...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.4003.pdf
We show from first principles that an incoherent photon pulse traversing a plasma can excite a plasma wake via Compton scattering. We distinguish two regimes: i) the non-relativistic regime, where the incoherent photons have energy below the electron rest mass, and ii) the relativistic regime, where the incoherent...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.4005.pdf
Theory predicts that a magnetically confined electron-positron plasma with short Debye length will be remarkably stable and exhibit unique wave physics. The APEX (A PositronElectron eXperiment) project is progressing toward an experimental realization of such a system to test some of those predictions. In this...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.4007.pdf
It is estimated that a commercial aircraft will experience a lightning strike event once per year. This poses a significant risk to poorly conducting, carbon-fibre composite aircraft structures. The most widely adopted approach of providing lightning strike protection, on composite aerostructures, is through the...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.4010.pdf
Water, methane, and ammonia are amongst the key components of Uranus and Neptune. Knowing their equation of state, conductivity, and transport properties at planetary interiors conditions (pressures of several megabar and temperatures of a few thousand Kelvin) is required for developing precise models of the two...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.4011.pdf
Gravitationnal waves have been predicted from Einstein's equations since he wrote his theory on General Relativity [1]. A century later, the LIGO [2] and VIRGO interferometers were at last able to pick up a gravitationnal wave from the merging of extremely massive astrophysical objects. The existence of gravitationnal...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.4012.pdf
The Ring Trap 1 (RT-1) device creates a laboratory magnetosphere that is realized by a levitated superconducting ring magnet in vacuum [1]. The RT-1 experiment has demonstrated the self-organization of a plasma clump with a steep density gradient; a peaked density distribution is spontaneously created through 'uphill...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.4013.pdf
Electron cyclotron instabilities caused by resonant interaction between energetic electrons and electromagnetic waves are typical for plasma confined in open magnetic configurations. Studies of the cyclotron instabilities of non-equilibrium plasmas have led to the plasma cyclotron maser paradigm, which explains a...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.4014.pdf
Shock formation through the interaction of supersonic plasma jets with ambient plasma is ubiquitous in astrophysics. Since magnetic fields often play a role in these systems, it is of particular interest to understand how they affect the formation and evolution of shocks. An investigation of magnetized shocks has...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.4015.pdf
In recent years, experiments with laser-target interactions create plasma with extremely strong magnetic fields (~ MGauss). With these conditions, and the unprecedented resolution that these experiments can now operate, we are able to probe physics that also occurs in astrophysical systems. In particular, the...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.4016.pdf
MegaGausslevel magnetic fields applied to laser produced plasmas are opening the door to a range of new studies in inertial confinement fusion and laboratory astrophysics. Our experiments and related theoretical work have addressed the physics of magnetized accretion flows [1], jet collimation [2, 3] and variability...
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http://ocs.ciemat.es/EPS2019ABS/pdf/I1.201.pdf
The trapping of femtosecond laser pulses of relativistic intensity deep within ordered nanowire arrays can volumetrically heat dense matter into a new ultra-hot plasma regime [1]. Electron densities more than 100 times greater than the critical density with multi-keV temperatures are achieved using ultrashort laser...
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http://ocs.ciemat.es/EPS2019ABS/pdf/I1.301.pdf
Particles immersed in a plasma undergo charge fluctuation due to collisions with ions and electrons which has a strong bearing on their aerosol dynamics and thermal balance. As a matter of fact, a significant fraction of nm-sized particles can be non-negatively charged which enhances the coagulation kinetics and as a...
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http://ocs.ciemat.es/EPS2019ABS/pdf/I1.202.pdf
The investigation of superintense laser-driven ion sources and their potential applications offer unique opportunities of multisciplinary research [1]. Plasma physics can be combined with materials and nuclear science, radiation detection and advanced laser technology, leading to novel research challenges of great...
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http://ocs.ciemat.es/EPS2019ABS/pdf/I1.302.pdf
Dense metallic plasma is a complicated object for both theoretical and experimental study. Due to very high coupling and degeneracy parameters traditional chemical picture and perturbation approaches are of questionable applicability for such plasma. Strong correlation effects hamper the usage of average atom models....
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http://ocs.ciemat.es/EPS2019ABS/pdf/I1.103.pdf
Energetic particles in the MeV range are ubiquitous in fusion devices [1]. On one hand, they can be suprathermal ions born from the fusion reactions or accelerated by ion cyclotron resonance heating. On the other hand, they can be runaway electrons (REs) that are spontaneously generated, for example, during a...
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http://ocs.ciemat.es/EPS2019ABS/pdf/I1.203.pdf
Generation of laser-driven quasi-static magnetic fields (B-fields), in the range of the kTesla, paves the ground for novel high energy-density physics (HEDP) investigations.
I will review results and physical understanding in driving such strong B-fields. At LULI [Santos2015] and Gekko-XII [Law2016] laser facilities,...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I1.303.pdf
ow pressure gaseous plasma is a suitable medium for tailoring surface properties of solid materials on industrial scale. Treated materials are subjected to positively charged atomic and molecular ions, neutral radicals and ultraviolet as well as vacuum ultraviolet radiation. The penetration depth of ultraviolet...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I1.403.pdf
Collisionless shocks are ubiquitous in the Universe and play an important role in the slow down of plasma flows, magnetic field generation/amplification, and particle acceleration. Depending on the plasma conditions, different plasma processes are believed to mediate shock formation and particle injection, however,...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I1.404.pdf
The interactions of fast-streaming, magnetized plasmas can result in a wide range of fundamental plasma physics processes such as the formation of MHD shocks, magnetic turbulence, reconnection and wave-particle interactions. We present experiments from a versatile platform, where supersonic plasma flows generated by the...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.005.pdf
Hollow Cathodes are high-density plasma sources that are non-equilibrium from their principle. They are characterized by high activation and ionization degrees and can work in a broad range of parameters - pressures, powers and gas flows. They are scalable, versatile and cost effective. They enable both PVD (Physical...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.101.pdf
The European roadmap for fusion energy has identified plasma exhaust as a major challenge towards the realisation of magnetic confinement fusion. To mitigate the risk that the baseline scenario with a single null divertor (SND) and a high radiation fraction adopted for ITER will not extrapolate to a DEMO reactor, the...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.102.pdf
This contribution reviews the currently applied wall conditioning methods in fusion devices with special emphasis on wall conditioning in the presence of a permanent magnetic field by applying RF discharges at the ion- and electron cyclotron range of frequencies (ICRF resp. ECRF). The review is built upon the results of...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.301.pdf
Tremendous progress that experiences the field of the nano-fabrication opens new entrancing opportunities in terms of the production of materials with advanced functionalities. In spite of undisputable successes of chemistry-based methods or strategies that utilize nanolithography, the use of these methods brings also...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.J501.pdf
The rapid, picosecond time-scale evolution of electron density and temperature in a laser-produced plasma was measured using collective Thomson scattering [1]. As is the case for many laser-plasma applications, an underdense (~10^19 cm^-3) H2 plasma was created by a 60-ps, 1053-nm laser pulse with an intensity of ~3 x...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.302.pdf
Electron energy distribution functions (eedf), vibrational and electronic excited states are selfconsistently coupled for discussing the formation of ammonia under nano-second repetitively pulsed discharges. The Boltzmann equation for free electron is solved to determine the eedf, accounting for inelastic, superelastic...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.J502.pdf
Powerful gamma-ray emissions are ubiquitous in astrophysics, from active galactic nuclei [1] to pulsars [2] and neutron star mergers [3]. One of the key mechanisms leading to powerful gamma-ray emissions is thought to be the interaction of ultrarelativistic particle beams with a surrounding plasma environment, which...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.J503.pdf
High power, short pulse lasers have become valuable tools for scientists exploring a wide range of phenomena and developing new technologies such as ultra-compact wakefield accelerators [1] and compact light sources [2] with applications ranging from particle physics to biology. To produce ultra-intense, short pulses,...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O2.107.pdf
Tungsten (W) is a candidate for plasma-facing components in future fusion reactors like DEMO and already used in fusion experiments like JET-ILW and ITER, which is currently under construction. It is foreseen for wall areas of highest particle and power loads as it has high melting point and low physical sputter yield....
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O2.108.pdf
The initial current ramp phase of JET hybrid plasmas is used to optimise the q-profile to allow access to high beta and avoid MHD instabilities. Mixed protium-deuterium experiments have shown that the q-profile evolution during this phase varies systematically with average main ion isotope mass (Meff), as seen in Fig.1,...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O2.302.pdf
The plasma-wall interaction is a fundamental process determining the plasma parameters. The different types of sheathes over an planar/grooved emissive walls in electromagnetic fields of discharge plasmas are discussed in this paper. In kinetic simulations and in experiments, we found a plasma sheath rearrangement...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.J504.pdf
The extremely energetic class of astrophysical phenomena - including high-energy pulsar winds, gamma ray bursts, and jets from galactic nuclei - have plasma conditions where the energy density of the magnetic fields exceeds the rest mass energy density (sigmacold = B^2/(µ0nemec^2)), the cold magnetization parameter)....
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O2.105.pdf
In magnetic confinement fusion, transport processes in the plasma edge region determine the power load onto the first wall materials which has to be minimized on the way towards a fusion power plant. While a main fraction of the power is transported parallel to the magnetic field lines to the divertor, a significant...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O2.109.pdf
Understanding the physics of the NTM onset and its suppression is a key problem in achieving controlled fusion. This requires better knowledge of the NTM threshold mechanism.
We solve the drift kinetic equation for the ion/electron response to the NTM magnetic perturbation, gi,e, assuming small magnetic island width,...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O2.303.pdf
Microwave plasmas sustained at atmospheric pressure are applied in many fields due to the flexibility and high chemical reactivity that result from non-equilibrium operation conditions. However, the performance of a plasma in a specific technological application is determined by the density of active species and their...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O2.106.pdf
Observations of divertor plasma turbulence in a series of experiments at the DIII-D tokamak has recently demonstrated the onset of parallel current and magnetic field fluctuations [1] with temporal parameters similar to those reported for the fluctuations of divertor plasma radiation intensity at the ASDEX Upgrade...
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1001.pdf
SPARC is designed to be a high-field (B0 = 12 T), compact (R0 = 1.65 m), D-T burning plasma tokamak with the goal of producing net energy gain (Q > 1) from magnetic fusion for the first time. Currently in the pre-conceptual design phase, SPARC will utilize new magnets based on rare-earth barium copper oxide (REBCO) high...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1002.pdf
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1003.pdf
The edge of magnetically confined plasmas in toroidal configurations is characterized by the presence of various magnetic perturbations (MPs), appearing spontaneously as tearing modes in the Reversed Field Pinch (RFP) [1] or as peeling ballooning modes (ELM) in the tokamak. In the RFX-mod device during high-current...
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1005.pdf
First of a kind physics-based simulations project a compact net electric fusion pilot plant with a nuclear testing mission is possible at modest scale based on the advanced tokamak concept, and identify the key parameters for its optimization. These utilize a new integrated 1.5D core-edge approach for whole device modeling...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1006.pdf
Disruption prediction and avoidance is necessary in future MAST-U spherical tokamak discharges to enable long-pulse plasma operation. Research examining the stability of plasmas in the MAST database utilizing new kinetic equilibrium reconstructions and comparisons to present models in the Disruption Event Characterization...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1007.pdf
The Alborz tokamak project has been in the phase of construction at the Amirkabir University of Technology, Iran, since 2012. The completion of this new fusion experimental device fabrication accomplished recently and the start of its commissioning phase is scheduled for the near future. To this end, the initial system...
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1008.pdf
The ITER Integrated Modelling & Analysis Suite (IMAS) is the software infrastructure developed using expertise from across the research facilities within the ITER Members to meet the needs of the ITER Integrated Modelling Programme. It builds around a standardised representation of data described by a Data Dictionary that...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1009.pdfAn analysis is carried out of the possibility of using the high-resolution spectroscopy (HRS)
data, specifically, the asymmetry of the spectral line shape of the radiation emitted in the
Balmer-alpha lines of hydrogen isotopes, to recover the flux of neutral hydrogen atoms and
molecules from the tokamak first wall to the SOL...
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1010.pdf
Electron cyclotron radiation (ECR) in ITER (in contrast to all previous devices) is expected to play an important role in power loss balance due to high electron temperature and high magnetic field [1], [2]. This radiation is also a source of additional thermal and electromagnetic load for microwave and optical diagnostic...
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1011.pdf
Present day Fast Ion Loss Detectors (FILD) installed in tokamaks and stellarators are usually made of a scintillator coupled to a suitable optical system. For the conceptual design of an ITER-relevant FILD prototype for JT-60SA (using a scintillator as sensitive element) it was suggested that the neutron flux that will be...
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1012.pdf
DEMO-FNS is a tokamak-based fusion neutron source project being developed in Russia [1]. Issues of energy removal from DEMO-FNS were considered in [2], [3] in the "closed box" [4] approximation where the external sources and sinks of the particles, such as gas puffing and pumping, are essentially neglected. In the present...
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1014.pdf
Tokamak Energy Ltd. have recently completed the first programme of operations within the compact (R = 0.4 m) spherical tokamak ST40. During the first programme ST40 was operated without a central solenoid and start-up was achieved using the Merging/Compression technique. Plasmas with a 15 ms (flat top) duration were...
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1016.pdf
Recent experiments performed in DIII-D provide strong evidence that the edge particle source has important effects on the density pedestal structure. These experiments were performed primarily in two divertor configurations, one a very open divertor (little baffling of neutrals) and one highly closed (good baffling of...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1018.pdf
H-mode tokamak plasmas are typically characterised by quasi-periodic instabilities called edge localised modes (ELMs) driven by unstable peeling-ballooning modes [1]. For large scale fusion power plants, the predicted particle and heat fluxes are unacceptable, and an active ELM control method is required. One promising...
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1020.pdf
The radial electric field Er is thought to play a role in the suppression of turbulence in the edge transport barrier that causes H-mode confinement in tokamaks. A range of mechanisms have been proposed that may positively or negatively contribute to Er. Among the non-ambipolar particle transport channels that together...
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1024.pdf
JET is a unique tokamak equipped with the ITER-like wall (ILW) comprised of beryllium (Be) main chamber and tungsten (W) divertor. JET allows operation with tritium (T), thus studying the H/D/T isotope effect on the plasma-wall interaction (PWI). Be limiters meet the most of the direct plasma impact, however part of the...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1025.pdf
The performance and operation of magnetic confinement fusion devices strongly depend on the characteristics of PFCs, which represent the principal source of impurities and, through deuterium recycling, can contribute substantially to plasma fueling. A commonly-used method to reduce and control these effects is to...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1027.pdf
First impurity seeding experiments with N and Ne injection in the new SAS (Small Angle Slot) divertor at DIII-D show the simultaneous achievement of divertor detachment, stable discharge behavior and unchanged (N) or even improved pedestal performance (Ne). N seeding in the SAS divertor leads to the simultaneous...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1028.pdf
We will present first results from the fast-moving Reciprocating Divertor Probe Array (RDPA). This novel diagnostic provides two-dimensional (2D) Langmuir probe measurements across the TCV divertor plasma up to the X-point, enabling unprecedented insights into divertor profiles and fluctuations. The 2D region is covered...
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1031.pdf
he tungsten ion average charge states in EDGE2D-EIRENE simulations of the JET scrape-off layer are predicted to decrease by up to 40% when the 74 ion states are bundled into 6 fluid stages, compared to reference cases using the Monte Carlo code DIVIMP and a more elaborate bundling scheme in EDGE2D-EIRENE. The ionization...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1033.pdf
Mixed-material DIVIMP-WallDYN modelling, now incorporating ExB drifts, is presented that simultaneously reproduces tungsten (W) erosion and deposition patterns observed during the DIII-D Metal Rings Campaign, in which toroidally symmetric W-coated tiles were installed in the carbon (C) DIII-D divertor. It is demonstrated...
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1035.pdf
Filaments are field aligned density and temperature perturbations, which provide a significant flux of particles and heat from the last closed flux surface to the far scrape-off layer (SOL). In order to design next generation tokamaks operating in high density regimes, it is beneficial to make robust predictions of wall...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1036.pdf
Understanding how the scrape-off layer (SOL) power decay length q scales with plasma quantities is essential for designing fusion reactors and developing a power exhaust solution. An inter-machine database [1] showed that, in inter-ELM H-mode, q scales approximately inversely with the poloidal magnetic field....
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1037.pdf
During edge localised modes (ELMs) high heat fluxes are incident on divertor targets, which future fusion devices will not withstand [1]. A solution to reduce the heat fluxes could be the new Super-X divertor, which will be tested on the MAST-U tokamak. The divertor has an increased connection length, magnetic flux...
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1038.pdf
The process of divertor detachment, whereby heat and particle fluxes to divertor surfaces are strongly mitigated, is required to reduce heat loading and erosion in a magnetic fusion reactor.
In previous research [1] we have provided a full interpretation of particle/power balance in the TCV (L-mode) divertor using...
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1039.pdf
The divertor heat-flux problem remains a major challenge for both present and future high power tokamak fusion experiments and pilot power plant designs. Current divertor designs are informed by large-scale fluid simulation codes, e.g. SOLPS, UEDGE, EDGE2D, but none of these presently capture important kinetic effects in...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1043.pdf
In ITER and other next-generation fusion devices, divertor detachment will be crucial to limit the heat and particle fluxes to plasma-facing components to tolerable levels. This work investigates the importance of molecular effects on detachment. A type of molecular reaction of interest in this work is Molecule-Activated...
see full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1045.pdf
COMPASS Upgrade (COMPASS-U) is a medium-size, high-magnetic-field and high-density tokamak project with a flexible set of the poloidal field coils for generation of the single-null, double-null and snowflake divertor configurations. With its high plasma and neutral density, closed divertor and strong ITER-like target...
see full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1047.pdf
Powerful plasma load on the plasma facing material in tokamaks during transients (disruption, ELMs, VDE etc.) produces several multiscale effects including surface erosion, redeposition of eroded materials, melting and melt motion over the surface, inhomogeneous solidification leading to specific surface clustering...
see full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1048.pdf
The recent operation phase OP1.2b of the superconducting stellarator Wendelstein 7-X (W7-X) was the first experimental campaign with a boronized wall in this machine. Wall conditioning by means of boronization is a standard technique to reduce the influx of intrinsic impurities, typically carbon and oxygen, from plasma...
see full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1052.pdf
The topology of the Wendelstein 7-X edge and scrape-off-layer exhibits stochastic fields, island chains, highly varying connection lengths, and a non-uniform curvature drive for plasma turbulence. These challenges have previously inhibited successful development of a plasma fluid turbulence simulation framework. The BSTING...
see full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1053.pdf
The W7-X stellarator with its large aspect ratio has spectrally well separated electron cyclotron harmonics compared to tokamaks. Because of this geometrical advantage, it is easier to address the electron cyclotron harmonics (70,140,210...GHz) at a magnetic field of 2.5 T. In a standard electron cyclotron emission (ECE)...
see full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1055.pdf
Balmer-alpha spectroscopy allows important and versatile investigations of fusion plasmas. In particular active spectroscopy with lines of sight intersecting the paths of neutral beams has become an important diagnostic technique since it carries information on important plasma parameters such as the fast-ion density, the...
see full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1056.pdf
Plasma physics experiments often require a fast estimation of plasma parameters for machine control and safety. On the other hand, to do scientific inference a thorough post-processing analysis and uncertainty handling is carried out. The fast parameter estimation can benefit from a more rigorous handling of the...
see full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1057.pdf
In contrast to axi-symmetric devices, the particle fluxes in helical devices strongly depend on the radial electric field Er. This sets a constraint on the radial electric field for given plasma density and temperature profiles, and makes it a key quantity for the neoclassical transport. In recent years, Doppler...
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1063.pdf
Wendelstein 7-X is a modular advanced stellarator, which successfully finished its second test divertor unit experimental campaign in October 2018. Besides establishing divertor operation, this campaign was devoted to the verification of the optimization principles of the machine in different magnetic configurations,...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1064.pdf
The BEAMS3D stellarator neutral beam injection (NBI) code [1] is validated against the experimental data of Wendelstein 7-X (W7-X). Experiments scanning density and magnetic configuration were performed in W7-X with the newly commissioned NBI system. Composed of two sources in a single beam box, this NBI system provided...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1066.pdf
During the past operational phase OP1.2b at Wendelstein 7-X (W7-X), wall conditioning via repeated boronization led to enhanced plasma performance. To further support safe W7-X operation, an additional plasma heating interlock system, based on the measured diamagnetic energy (Wdia), has been successfully operated during...
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1067.pdf
The reconstruction of the plasma equilibrium plays an important role in interpreting diagnostic signals and understanding the plasma performance for toroidal fusion experiments. Reconstructing the plasma parameters is an iterative process that involves solving the MHD equilibrium, computing synthetic diagnostic signals...
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1068.pdf
Low frequency edge fluctuations, localized near the last closed flux surface, which show discrete losses of stored energy with each event, are seen especially clearly in specific magnetic configurations in Wendelstein 7-X. While these are certainly ELM-likea, the questions of the cause of these fluctuations is still open,...
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1070.pdf
Fast ion confinement is crucial for the demonstration of the stellarator approach towards fusion energy. To study confinement of fast ions with today's stellarators advanced RF heating schemes can be used to generate fast ions. Secondly, advanced RF heating schemes are developed to improve ion heating performance. Advanced...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1077.pdf
Understanding transport and validating computer simulations in magnetically confined plasmas is critical for developing predictive models and designing scenarios for future burning plasmas, such as ITER and SPARC. However, the highly nonlinear nature of turbulence means that simulations of plasma behavior are very...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1079.pdf
Gyro-fluid equations are velocity space moments of the gyrokinetic equation. The damping due to kinetic resonances is included through a closure scheme chosen to match the collisionless density response functions. This damping allows for accurate linear eigenmodes to be computed, even in the collisionless limit, with a...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1080.pdf
Our recent studies [1-3] have shown that heat transport in magnetic confinement devices (the stellarators TJ-II and W7-X) is not a smooth and continuous (diffusive) process, but involves mini-transport barriers associated with low-order rational surfaces and rapid non-local radial `jumps'. This remarkable finding sheds a...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1081.pdf
During the last decades, the transition from low to high plasma confinement (L-H transition) has been analysed in several tokamaks showing that the L-H power threshold depends non-linearly on plasma density. A common finding shown both for AUG and C-mod experiments, with different mixes of heating systems, [F. Ryter et al....
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1083.pdf
Magnetic confinement plasmas are usually primarily driven by heat sources, with limited particle sources, particularly in the core. This is also the case of a fusion reactor, where the limited penetration of the neutral particles leads to the requirement of using fuelling pellets. Depending on plasma conditions, the...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1084.pdf
Clear evidences that, due to a strong outward impurity convection, impurity core penetration is prevented have been found in the RFX-mod RFP device. A comparable convection of the main gas has not been observed [1] so that a favorable situation with peaked or flat density profiles and hollow impurity profiles is...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1086.pdf
The JT-60SA is a large device with a plasma volume 50% larger than JET, and up to 34 MW of NBI heating power. High performance deuterium plasmas are expected to produce neutron rates in excess of 10^(17) n/s. A significant fraction of the fusion reactions will be produced by high-energy NBI ions from 24 MW positive (PNB)...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1090.pdf
Since the first comparisons between different hydrogen isotope plasmas in tokamaks it appeared that deuterium (D) plasmas have generally better performances than hydrogen (H) plasmas [1-4]. The energy and particle confinement times [1-3], the L-H power transition [4,5] and the H-mode pedestal [3,6], essential parameters...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1091.pdf
The interaction of Geodesic Acoustic Modes (GAMs) and Zonal Flows with small-scale turbulence is an important topic in magnetic confinement studies. Much progress has been made in recent years on the measurement, interpretation and numerical simulation of the GAM-turbulence interaction. Using microwave reflectometry...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1092.pdf
This contribution reports on the impurity confinement in Wendelstein 7-X which was studied with dedicated impurity injection by means of laser blow-off. Basically, the understanding of impurity transport is a demanding task for stellarators with the aim of steady state operation. Especially, the accumulation of...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1093.pdf
Microtearing (MT) turbulence has been identified as a key player in the evolution of the Hmode pedestal due to its ability to produce electron thermal diffusivities very different from the ion heat and particle diffusivity channels [1]. However, important aspect of the physics of MT instability and turbulence under...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1094.pdf
Control of turbulent particle and heat transport is an important issue for magnetically confined fusion plasmas such as tokamaks and helical devices. Repetitive transport bursts due to the magnetohydrodynamic turbulence in the pedestal region, called the edge localized modes (ELMs), will be serious problems for future...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1095.pdf
Non-local transport and non-Gaussian probability density functions (PDFs) of turbulent fluxes are fundamental physical issues for magnetic confinement fusion that were addressed well in set of works (e.g., review [1] and references therein). Deviation of PDFs from a Gaussian distribution most easily to monitor by...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1096.pdf
Intermittent fluctuations in the scrape-off layer (SOL) are investigated by numerical simulations of two dimensional reduced fluid models describing the evolution of the electron density and electric drift vorticity in the two dimensional plane perpendicular to the magnetic field [1, 2, 3]. Long time series obtained by...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1098.pdf
Proper comparison of simulated turbulent fluctuations with experimental observations is necessary for code validation, and for establishing a link between experimental fluctuation measurements and the underlying physics. In this contribution we report on the progress of modelling localised measurements of turbulent...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1099.pdf
Turbulent transport in the Scrape-Off Layer (SOL) is an important issue in contemporary tokamak physics due to its role in deteriorating plasma confinement and enhancing the plasmawall interaction. This work compares turbulence properties on two poloidal locations, the outer midplane (upstream) and the divertor target...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1100.pdf
Divertor plates of tokamaks are known to be subjected to extremely high heat loads. Melting, cracking and other damages of Plasma Facing Components (PFCs) may occur [1]. Experiments in tokamaks after severe melting of tungsten (W) tiles in the divertor demonstrated that such damage events could compromise the reliable...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1101.pdf
Homogenization methods for dielectric mixtures have existed for over two decades, but their limitations regarding the wavelength of incoming beam did not allow them to be used extensively in tokamak plasmas. We present a new method which does not have the same limitations, with application to a dielectric plasma mixture...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1102.pdf
The FuZE device produces a 0.3 cm radius by 50 cm long Z-pinch between the end of the inner electrode of a coaxial plasma gun and an end wall 50 cm away. The plasma column is stabilized for thousands of instability growth time by an embedded radially-sheared axial plasma flow, a method proposed in Shumlak and Hartman...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1103.pdf
The Hall effect, defined as the separation of electric charges of opposite sign when they move in a magnetic field, is suggested to contribute substantially to the observed negative radial electric field E_r in the core plasma in tokamaks and, respectively, to the spontaneous/intrinsic rotation of plasma. A detailed...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2001.pdf
Temporal contrast is a crucial parameter for high-power short-pulse laser facilities. At insufficient contrast, amplified spontaneous emission (ASE) prepulse - which is inherent to lasers based on chirped-pulse amplification scheme - can create plasma on surface of a solid target before arrival of the main pulse. This...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2002.pdf
A lot of interesting results come from the triplet concept, where three waves with wavenumber and frequency match conditions interact with themselves, exchanging energy. For example, if the coupling factor is small in a way the frequency of the envelope of each wave is slower than the slowest frequency of the...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2003.pdf
Processes of laser energy absorption and electron heating in a hot plasma in the range of irradiances s Iλ^2 = 10^15 – 10^16 W µm^2/cm^2 are of prime importance for the shock ignition scheme of inertial confinement fusion. We studied these processes with large scale kinetic simulations [1, 2] and identified particular...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2005.pdf
Twenty years have passed since the seminal paper on Raman amplification in plasma by Malkin, Shvets and Fisch [1]. While Raman amplification has been explored very successfully in theory and simulations [2], no significant Raman amplification of a laser pulse beyond 0.1 TW or 6% efficiency has been achieved [3], and...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2006.pdf
Laser-driven neutron sources have recently attracted significant attention due to their potential uses in science, industry, healthcare, and security. In laser-matter interaction experiments, neutrons can be efficiently produced by nuclear reactions involving the laser-driven light ions [1]. Characterisation of these...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2007.pdf
All-optical approaches to ion acceleration are attracting a significant research effort internationally. Energetic ion beams can be readily generated by high intensity lasers via the target normal sheath acceleration (TNSA) process [1]. While the ion energies of such beams remain constrained by available laser...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2008.pdf
Investigations using the so-called Cavity Pressure Acceleration (CPA) method were carried out on the Prague Asterix Laser System (PALS). The main goal of this research was to test and analyze a possibility of increasing density of plasma objects accelerated by laser light in channel cavity targets. The...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2011.pdf
Spatially modulated electrostatic fields can be designed to efficiently accelerate particles by exploring the relations between the amplitude, the phase velocity, the shape of the potential and the initial velocity of the particle. The acceleration process occurs when the value of the velocity excursions of the...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2014.pdf
In the present analysis we study the dynamics of charged particles under the action of slowly modulated electromagnetic carrier waves. With the use of a high-frequency laser mode along with a modulated static magnetic wiggler, we show that the ensuing total field effectively acts as a slowly modulated high-frequency...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2015.pdf
In the present analysis we incorporate radiation effects to the study of the relativistic dynamics of charged particles submitted to the action of slowly modulated, high-frequency electrostatic waves with large amplitudes. Previous analyses ignoring radiation reaction indicate that this setting may be very efficient...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2016.pdf
Forthcoming multi-petawatt laser systems (e.g., CoReLS, Apollon, ELI, CAEP-PW) will soon make it possible to achieve laser intensities in excess of 10^22-10^23 Wcm^2. Laser-matter interactions under such extreme conditions will give rise to copious synchrotron or Bremsstrahlung emission of γ-ray photons, which may...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2017.pdf
The recent experimental and theoretical progresses have shown that plasma accelerators are very promising because they may provide a new generation of more compact particle accelerators and light sources for various technological and scientific applications. Plasma accelerators often use intense laser beams or...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2018.pdf
Radiation processes in plasmas are extremely relevant for a number of fields, ranging from astrophysics [1] to small scale microscopy [2]. These processes are usually associated with the motion of a large number of electrons, under the action of intense electric and magnetic self-consistent fields and require...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2020.pdf
Plasma with an electron beam is considered as a source of powerful electromagnetic (EM) emission in various space and laboratory environments. It is well known that in presence of two counterstreaming beams radiation efficiency significantly grows in contrast to the single beam case. This is explained by the fact that...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2021.pdf
A theoretical study of a uniform fast electron beam propagating in a plasma density gradient targets (low density core-high density cladding) is presented. The self-generated magnetic field is calculated using a rigid beam model in cylindrical geometry. It is found that the spontaneous magnetic field peaks at the...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2022.pdf
In fast ignition, an ultra-intense pico-second laser is irradiated to heat a pre-compressed fusion fuel up to the ignition temperature. When the laser-accelerated electron beam is used for core heating, the large beam divergence, the broad energy spectrum and the difficulty in generating fast electrons having suitable...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2024.pdf
A target is imploded by long-pulse implosion lasers and its compressed core is heated by fast electrons, which are generated by a short-pulse ultrahigh-intense laser, in the fast ignition scheme. As the location where fast electrons are generated is far from the core due to ablation plasmas, few of them can hit the...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2025.pdf
High power lasers with relativistic intensities above 1018 W/cm2 and pulse lengths exceeding picosecond (ps) have been developed in recent years. In over-ps laser-plasma interactions, energy slope of high-energy electrons tends to be higher than the scaling laws used in the sub-ps regime. One of the key mechanisms of...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2026.pdf
Laser focused intensity has been increasing since its invention, and is going to reach 1024 W/cm2 and beyond. These intense fields open the new regime of laser-matter interactions. One of the effect playing an important role in laser-matter interaction in this regime is a radiation reaction effect which is a back...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2028.pdf
In the Shock Ignition (SI) approach to Inertial Confinement Fusion (ICF), an intense laser spike is used to launch a high pressure converging shock in the spherical capsule at the end of the compression phase. In this way the compression and the ignition phases are separated and can be optimized independently. The...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2029.pdf
Collimated electron beams produced by intense laser pulses focused onto solid-density plasmas are studied intensively for many applications. Experiments and simulations have shown that the electron beams are emitted at an angle between laser specular and the target normal direction. In particular, an electron jet...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3001.pdf
The nonlinear features of the oscillatory motion of a single dust particle trapped in a standing striation are investigated. The method of the discharge current modulation [1, 2] is used to excite the nonlinear oscillations with the large amplitude of the order of 1.5 mm. The multi-resonance curves are obtained under...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3003.pdf
Currently, the developments in the field of alternative energy are becoming increasingly important due to the need to solve a vast number of problems associated with the creation of compact, reliable, autonomous power sources for spacecraft and other applications, where the conversion of solar energy into electrical...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3004.pdf
We present the helix jet - a stable plasma source with a large homogeneous plasma volume at atmospheric pressure. Challenging applications of material science in high-tech technology implement sources combining homogeneity and stability of vacuum based techniques with a multidimensional flexibility and instrumental...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3005.pdf
Here we present the results of experimental studies on the effect of an external longitudinal magnetic field in a high pressure discharge. Fig. 1 shows typical experimental time dependences of the voltage (upper), current density (middle) and calculated conductivity (lower) in the channel (argon, H=1.6·107 A/m, P=3...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3006.pdf
The interaction of neutral and charged gas components is in a high interest of modern physics. This attention is caused mostly by the aerospace applications as well as for exploring the nonlinear wave processes in the near-Earth space (ionosphere). In this work, the interaction of strong shock waves (supersonic bodies)...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3008.pdf
Dusty plasma is a system of charged micron-sized particles immersed in a plasma. This system is strongly non-ideal due to high charges of particles and strong interaction between them. Thus, observation of ordered structures in a dusty plasma is possible. Such ordered structures are called dusty plasma crystals.
The...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3010.pdf
An experimental and theoretical study of the formation of radiation spectra of cathode plasma in a pulsed discharge in argon at atmospheric pressure has been performed. To study the effect of small impurities of the material of the cathode material on the kinetics of ions and electrons in the discharge, the methods of...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3012.pdf
The kinetic effects on the dust particles observed in a plasma crystal locally irradiated by a narrow pulsed electron beam with energy 12 and 13 keV and peak current 4 mA are presented [1]. We observe in the top layer of the plasma crystal the formation of a stable dust flow along the irradiation direction in the first...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3015.pdf
Gold nanoparticles (GNP) have a wide range of applications in medicine, such as a radiosensitiser in radiotherapy[1], GNP coated single walled carbon nanotubes (SWCNT), to be used as a photothermal agent[2], targeted drug delivery systems, and other forms of cancer treatment and diagnostics[3]. Research into GNP production...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3016.pdf
In the present paper, we study the kinetic theory of instability of electrostatic lower hybrid waves1 (LHWs) in a dusty plasma containing potassium positive ions (K+). A relativistic electron beam (REB) propagating through the plasma containing dust grains, positive potassium ions, and electrons, drives the LHWs to...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3017.pdf
The lower-hybrid wave processes that take place under the interaction of the Earth's magnetosphere with dusty plasma near the lunar surface are considered. Lower-hybrid waves are excited in the regions of the transient magnetic and/or boundary magnetospheric layers due to the development of linear hydrodynamic instability....
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3019.pdf
Advantages of X-ray which is emitted by dense plasma focus (DPF) are high-speed shutter and high energy. It can be used as a tool for researching on the property and structure of an object with high speed movement such as turbine blade. This is the target research for Thailand Plasma 1 (TPF-1). The X-ray yield strongly...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4001.pdf
Flute oscillations are vortical motions which are highly elongated along the magnetic field. Their characteristic dimensions are much larger than the Larmor radius, and their frequency much smaller than the cyclotron frequency, of the ions. In contrast to the electrostatic drift wave, the flute mode belongs to the reactive...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4002.pdf
The question of how to impose an electric field perpendicular to the magnetic field in a highdensity magnetized plasma is central to a variety of applications with high societal impact. In recent years, it has been shown for instance that "crossed-field" rotating configurations could offer unique opportunities both for...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4005.pdf
The newly developed concept of supersolitary wave (supersoliton) describes a novel type of nonlinear localized structure. Its signature features are a very large amplitude in the electrostatic potential (pulse) and a characteristic wiggly structure in the associated electric field. Firstly, supersolitons were suggested in...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4006.pdf
Plasma is a multi-component gas, composed of ions, electrons and neutrals. Therefore, collisions between different plasma species must be entertained. Moreover, energy and momentum are redistributed by their presence in the plasma. The presence of negative ions in the system has a huge impact on the characteristics of...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4007.pdf
This paper reports the behavior of anode sheath in a planar dc discharge system brought about by changing the plasma boundary. Asymmetric parallel electrodes (anode dia. = 38 mm, cathode dia. = 76 mm, separation = 35 mm) were placed in a glass tube and covered by mica discs at the two ends of the glass tube. The whole...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4008.pdf
An experimental system SYMPLE (System for Microwave Plasma Experiments) is developed to investigate interaction of high power microwave (HPM) with an over-dense plasma ( plasma > microwave) to address the physics of various linear and non-linear mechanisms related to wave absorption in plasma1. A washer-gun based pulsed...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4011.pdf
A unified numerically solvable framework for dispersion relations with an arbitrary number of species drifting at arbitrary directions and with Krook collision is derived for linear uniform/homogenous kinetic plasma, which greatly extended the standard one [say, T. Stix, {\em Waves in Plasmas}, AIP...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4012.pdf
A number of effects, such as anomalous backscattering and anomalously ion acceleration, observed in experiments on electron-cyclotron resonant heating (ECRH) in magnetic fusion toroidal devices [1-2] are not explained within the conventional linear theory. The theoretical model proposed in [3] explains the anomalous...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4013.pdf
The phenomena of nonlocal (superdiffusive) transport are closely related to long-free-path carriers, called «Lévy flights» by B. Mandelbrot (see [1] and references therein). The processes of non-local transport with account of the finite velocity of carriers (i.e. of the retardation effect) are called «Lévy walks» [2, 3],...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4015.pdf
Low-temperature plasma finds a wide practical application in devices used in the current control circuits of space and ground-based nuclear power plants: modulators, thermionic converters, current and voltage stabilizers and etc. One of the most important requirements for devices of such appointment is the ability of...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4016.pdf
In many plasma applications, electromagnetic (EM) waves are key to providing energy. Plasmas can demonstrate complex dynamics when exposed to multiple EM signals. Raman coupling (by Langmuir oscillation) or Brillouin scattering (through ion-acoustic waves) are important in laser plasma interactions: Microwave beams can be...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.104.pdf
In perturbative experiments, the power deposition profile is a crucial ingredient in the analysis of the (turbulent) transport [1, 2]. Typically, the deposition profile is calculated with a forward model and used for the computation of the transport [3, 4, 5]. We will show that allowing for uncertainties in the...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.201.pdf
Experiments of laser-solid interaction at ultra-high contrast have recently demonstrated the possibility of exciting resonant propagating surface plasmons at relativistic intensities (> 10^18 W/cm^2) on solid grating targets [1]. Not only this encourages the development of a suitable theoretical description of plasmonic...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.J701.pdf
Since the pioneering work of the Bochum team on exciting plasmas with non-sinusoidal "Tailored" Voltage Waveforms and generating an Electrical Asymmetry Effect [1], the complexity and power of this technique has come into clearer focus. By decoupling the ion bombardment energy from the ion and radical flux at the...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.J801.pdf
Efficient particle acceleration is produced in association with solar flares. These particles play a major role in the active Sun because they contain a large amount of the magnetic energy released during flares. Energetic electrons and ions interact with the solar atmosphere and produce high-energy X-rays and -rays....
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.105.pdf
Impurities are unavoidable in fusion plasmas and potentially highly problematic as they result in fuel dilution and radiative energy losses. Accurate predictions of fusion plasma performance, therefore, require a validated theoretical description of impurity transport, which in turn requires high accuracy measurements...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.J702.pdf
Nanotextured metal and metal oxide thin films are of interest for an increasing number of catalytic applications ranging from fuel cells to photoelectrochemical water splitting, from photochemical wastewater treatment to biodiesel production. The need for enhanced performance and versatility has correspondingly...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.J802.pdf
The complex interaction of the magnetic field with matter is the key to some of the most puzzling observed phenomena at multiple scales across the universe, from tokamak plasma confinement experiments in the laboratory to the filamentary structure of the interstellar medium. King among these is the phenomenon of...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.J703.pdf
In the fusion plasma reactors most of the plasma is contained in the hot core. Nevertheless, there is a cold outer layer of plasma in the vicinity of the walls, which is crucial to the survival of the plasma vessel and therefore the reactor itself. This layer is cold enough to have a significant molecular component,...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.J803.pdf
The solar wind is a supersonic turbulent flow that spreads out radially form the Sun. Several spacecrafts explored different regions of the Heliosphere and provide us in-situ data of plasma and electromagnetic fluctuations from daily to sub-second scales. The solar wind can be though as a wind tunnel in which...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O2.201.pdf
Recently we have proposed an efficient scheme of generation of short dense electron bunches and atto-pulses during the interaction at large angles of incidence of a laser pulse with a limited foil target [1]. Later [2], the generation of high-intensity atto-pulses has been investigated also in a hollow cone-like target....
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O2.202.pdf
It was found recently [1] that counterpropagating plasma wakefields driven by a pair of femtosecond laser pulses with different transverse structures can produce powerful and narrowband EM emission near double plasma frequency. Such a nonlinear process can proceed in a homogeneous plasma, does not require the creation...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.J704.pdf
Tokamak experiments approaching thermonuclear conditions, like ITER, must face seriously the safety issues related to the release of debris in dust or droplet form from the vessel first wall. In case of loss-of-vacuum accidents, there is a safety hazard due to remobilisation of inhalable toxic or radioactive dust...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O2.112.pdf
Turbulent transport and its impact on ITER performance is investigated with the global flux-driven gyrokinetic code GYSELA. In that framework, a heat source, balanced by turbulent cross-field transport, determines the temperature profile. It is expected that the heat sink at the boundary and turbulence in the edge may...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I3.201.pdf
In Inertial Confinement Fusion (ICF), an indirectly driven implosion begins with an acceleration phase when the hohlraum x-rays ablate the shell surface and the capsule starts to converge. At this stage, outer-shell non-uniformities grow due to the acceleration-phase Richtmyer-Meshkov (RM) and Rayleigh≠Taylor (RT)...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I3.401.pdf
A charged particle moving through a medium emits Cherenkov radiation when its velocity exceeds the phase velocity of light in that medium. Since light in vacuum is usually assumed to move at the universal speed c, causality appears to preclude vacuum Cherenkov radiation (VCR). Under the influence of a strong...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I3.102.pdf
Two of the highest priorities in stellarator research are to verify the effects of orbit driftoptimization on the energy core confinement and to learn to prevent the accumulation of impurities in high-density plasmas. The basic framework for understanding energy and particle transport in these devices is neoclassical...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I3.202.pdf
The direct and indirect drive schemes to ICF make use of a large number of laser beams arranged in a symmetric angular distribution. The preferential decay geometry of the three waves resonant couplings, mainly responsible for backscattered light in single beam experiments, may then be deeply modified in the region of...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I3.302.pdf
Securing safe and cheap energy and using it effectively is a serious problem for modern society. As a solution to this, he is performing research on innovative green nanodevices. We are developing power generating devices, storage devices, low-power-consumption devices, multifunction Nano-devices and nano-energy systems...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I3.402.pdf
Plasma turbulence has been investigated using unprecedented high-resolution ion velocity distribution measurements by the Magnetospheric Multiscale mission (MMS) in the Earth's magnetosheath. This novel observation of a highly structured particle distribution suggests a cascadelike process in velocity space [1], as...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O3.101.pdf
The role of the radial electric field in high performance ion-root plasmas on Wendelstein 7-X (W7-X) is examined and compared with neoclassical predictions. In stellarator plasmas the neoclassical radial electric field (Er) is not intrinsically ambipolar, and is instead strongly tied to the plasma profiles. The...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O3.301.pdf
Constriction, which is the fundamental phenomenon of gas discharge physics, has been attracting the attention of scientists for more than a century. However, scientists still discuss [1], what is the main mechanism, which leads to a constriction. Among all mechanisms one can name the inhomogeneous heating of a neutral...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O3.302.pdf
Microwave (MW) discharges are one of the most flexible plasma devices operating under wide range of experimental conditions which makes them suitable for many practical applications. However, at atmospheric pressures, the plasmas tend to contract, forming the spatially inhomogeneous and possibly temporally unstable...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O3.103.pdf
Energetic alpha particles generated by D-T fusion reaction and beam ions for plasma heating interact resonantly with shear Alfvén waves through damping process when their velocity is comparable with Alfvén velocity, resulting in excitation of energetic particle (EP)-driven MHD instabilities. Several types of EP-driven...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O3.203.pdf
In indirect-drive inertial confinement fusion (ICF) a high-Z enclosure (or "hohlraum") surrounds a low-Z capsule containing DT fuel inside a low-Z spherical shell. Laser beams irradiate the interior of the hohlraum through a pair of laser entrance holes, in turn creating an x-ray radiation "bath" that compresses the...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O3.303.pdf
Two-dimensional (2D) complex plasma crystals are popular model systems where various generic as well as plasma-specific phenomena can be studied in real time at the level of individual particles. System-size dependence of the plasma crystal properties is an important issue which is not fully understood due to the...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O3.401.pdf
Magnetic dipole fields have exellent confinement properties for charged particle ensembles with an arbitrary degree of neutrality. One idea to create a magnetized low-energy electron-positron pair plasma pursued by the APEX/PAX collaboration relies on the initial formation of a non-neutral plasma in the confining...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O3.204.pdf
For the last couple of years, large efforts have been invested at CEA/DAM to develop the 3D radiationhydrodynamics code TROLL. Indeed, 2D radhydro codes are the main tool to design and analyze HED and ICF experiments. Yet, many of the first are intrinsically 3D, for example: few laser beams in directdrive or study...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O3.402.pdf
Nonlinear synchronisation is a key process in wave-particle interaction [1], responsible for Landau damping as well as for the amplification in devices like traveling wave tubes and gyrotrons [2]. We investigate it using the finite-N approach from a self-consistent hamiltonian formalism [3]. This description is combined...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O3.105.pdf
High-density operation is an attractive target for a fusion reactor, as it raises the fusion power output. Stellarators are especially suitable for such a regime, because they are not restricted by the disruptive density limit and because their energy confinement is roughly proportional to the square root of the...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O3.205.pdf
The shock ignition (SI) approach to inertial confinement fusion promises ignition at a lower laser energy than conventional hotspot schemes. The target is initially driven at a low-implosion velocity, which reduces hydrodynamic instabilities, and then ignited by a high-intensity spikethat launches a strong shock into...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O3.403.pdf
In laser plasmas, as well as in solar and stellar winds, ions and electrons can have comparable energies and strongly anisotropic velocity distributions. Under those conditions both fractions of a collisionless plasma can make a significant contribution to the development of the Weibeltype instability and the subsequent...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I4.010.pdf
The interstellar medium is a multi-phase, magnetized, and highly turbulent medium. In this talk, I will address both theoretical and observational aspects of interstellar turbulence. In the first, theoretical part of the talk, I will discuss the sources of turbulence, the properties of the turbulent cascade, the...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I4.401.pdf
Large amplitude, turbulent Alfvénic fluctuations have been commonly observed in the solar wind since the first in-situ measurements. An important but still unexplained property of such nonlinear fluctuations seen typically in the fastest streams is that, despite the large excursion of the magnetic field fluctuations,...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.301.pdf
In 2016 the group of experimentalists led by Eduard Sosnin in the Institute of High Current Electronics has been discovered a new phenomenon in gas discharge physics: an extended plasma jet developing perpendicular to the bending point of the arc discharge channel between two electrodes (E.A. Sosnin et al., JETP Lett.,...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.302.pdf
The purpose of this paper is to present simple and accurate practical expressions to estimate the viscosity and self-diffusion coefficients of three-dimensional Yukawa fluids in a wide parameter regime. The expression for the viscosity coefficient is based on a freezing temperature's scaling discussed recently by...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I4.J501.pdf
The nonlinear synchrotron radiation of direct laser-accelerated electrons in nearcritical density (NCD) plasmas recently has been proposed as a very efficient scheme to produce multi-MeV gamma-rays [1]. In this presentation, we demonstrate that by employing a plasma density channel, the divergence angle and transverse...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I4.J601.pdf
Inhomogeneous drift-wave turbulence with zonal flows (ZFs) can be modeled as effective quantum plasma where the ZF velocity serves as a collective field [1, 2]. This effective plasma can be described, quite intuitively, by a Wigner-Moyal kinetic equation (WMKE), which was originally introduced as phase-space...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.101.pdf
We observe the formation of a high-pressure staircase pedestal (~16-20 kPa) in high beta p plasmas (beta p>1.5) in the DIII-D tokamak when large amplitude ELMs are suppressed using resonant magnetic perturbations (RMP). The pedestal cyclically transitions from a one-step structure to a wider two-step staircase...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.201.pdf
The manipulation of intense laser fields by solid-state devices is severely limited due to nonlinearities and damage threshold issues as the fluence of high-intensity laser pulses is more than five orders of magnitudes larger than what conventional materials can sustain. In recent years, novel concepts how structured...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.102.pdf
A strong, favourable isotope dependence of the energy confinement (tao E,th ~ A^0.4) has been found in Hydrogen (H) and Deuterium (D) JET-ILW type I ELMy H-modes, originating at the pedestal [1]. Also, the plasma density is systematically lower in H than in D plasmas [1]. This contribution examines the isotopic...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I4.J602.pdf
Fast ions denote a part of the ion population of a plasma that exhibits speeds far above the thermal average. They appear in astrophysical plasmas, e.g. as Solar Energetic Particles (SEPs)[1]. In fusion plasmas, fast ions originate from fusion reactions or neutral beam injection and their confinement is crucial to the...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.203.pdf
A study of the influence of laser focal spot size on the acceleration of protons at intensities up to 5 x 10^21 Wcm^-2 is presented. Through the use of ellipsoidal, F/1 focusing plasma mirrors, focal spot sizes (~ 1.5 µm) on the order of the laser wavelength (1.054 µm) are achieved [1, 2]. Results are compared with...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.J501.pdf
We study formation of large amplitude standing ion acoustic waves (SIAW) by nonlinear phase-locking (autoresonance) with a weak, chirped frequency standing ponderomotive drive. These waves comprise a nonlinear two-phase solution each phase locked to one of the two traveling waves comprising the drive. The autoresonance...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.104.pdf
In future fusion devices the collisionality Nue proportional to ne/Te^2 at the pedestal top will be very low, i.e. nue,pedtop ∼0.06 [1], due to the expected high temperature. On the other hand at the very edge it should be high, nu*e,sep ∼12, because a high separatrix density is necessary for efficient power exhaust....
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.204.pdf
Achieving a light source delivering intensities up to the Schwinger limit of 10^29W/cm^2 would allow exploring novel regimes of strong-field Quantum ElectroDynamics (QED) where vacuum would be ripped apart. A promising candidate to build such a light source would be to find a realistic implementation of the Curved...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.J502.pdf
Magnetic reconnection is a phenomenon which is of great interest to many researchers because of both its application to astrophysical situations and potential effects within hohlraum geometries. Laser-solid interactions allow a reconnection region to be generated in between laser spots, as previously investigated by...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.205.pdf
The interaction of intense laser beams with plasmas created on solid targets involves a rich non-linear physics. Because such dense plasmas are reflective for laser light, the coupling with the incident beam occurs within a thin layer at the interface between plasma and vacuum. One of the main paradigms used to...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.J503.pdf
Re-entrant cone was so far mainly used in the high energy density physics research especially in the laser fusion and has been proven to have an effective control on the fast electrons mainly for the fast ignition research [1]. Sentoku has shown that the re-entrant cone can increase the laser intensity up to 20 times...
See the full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1001.pdf
This work presents initial results of the development of a Phase Contrast Imaging (PCI) diagnostic operating with a probe wavelength of 1.55 µm. While worldwide PCI systems use a 10.6 µm probe laser to relax technical constraints on the interferometric measurement, this reduced wavelength would permit new capabilities...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1002.pdf
Phase-space tomography is an established technique for inferring physical properties (namely temperature, density and drift velocity) of thermal species in fusion plasmas. Consistent efforts have already been made to extend those techniques to fast ions generated by fusion reactions or auxiliary heating in order to...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1003.pdf
Tokamak COMPASS Upgrade will be a high-field high-density fusion experiment aimed also at investigation of advanced divertor scenarios. One of proposed diagnostic systems is based on time-proven technique of Langmuir probe measurements. However, to operate these probes in the harsh environment of such machine, specific...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1004.pdf
Lithium is the most promising liquid metal, considered as potential for plasma-facing elements. It was experimentally shown, that the use of lithium in tokamaks increases plasma confinement time, decreases the amount of impurities in the plasma, and decreases hydrogen recycling on the plasma facing components. Experiments...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1005.pdf
The estimation of 2D plasma emission profile via tomographic reconstruction inherits the ill-posed inversion characteristic and is constrained by the limited number of plasma observations sights/directions. Such complex estimation is carried out by special mathematical treatments like the series expansion method....
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1006.pdf
Predictive modeling of passive signal of tokamak edge plasma charge-exchange recombination spectroscopy (CXRS) diagnostics remains a problem because of the necessity to combine solutions of theoretical problems, which need sophisticated numerical modeling. This includes: (i) modeling of the SOL(+divertor) plasma with...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1009.pdf
Filamentary-like plasma perturbations are routinely observed in many tokamaks. They are the result of non-linear development of some peripheral MHD instabilities in the region of the maximum plasma pressure gradient [1]. As soon as filaments can play a key role in the anomalous transport of particles and energy at plasma...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1013.pdf
A detailed characterization of flows, density and temperature profiles is necessary to shed light on transport in magnetically confined fusion devices. The most common technique to measure these profiles is Charge Exchange Recombination Spectroscopy (CXRS). The CXRS systems are usually located at the low field side but...
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1014.pdf
Helium is widely used in laboratory fusion experiments both as a fuel, for example in the first phase of ITER, as a minority gas for some RF heating schemes and will occur as ash from the thermonuclear reactions. In order to make reliable predictions for future devices and analyse discharges produced in ITER's non-nuclear...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1015.pdf
Mitigating head load on the divertor target is considered as one of the critical challenges to achieve a commercial fusion reactor. Fortunately, both density and temperature at the divertor target can be reduced significantly through a process called "detachment", leading to tolerable heat flux. However, our current...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1016.pdf
Understanding turbulence and anomalous transport in tokamaks remains an important open issue in plasma physics for fusion devices. A prominent feature of turbulence in the Scrape Off Layer (SOL) region are blobs, coherent filamentary plasma structures that drift across the magnetic field lines at high velocities (~km/s)...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1020.pdf
Fluctuation beam emission spectroscopy (BES) is an active plasma diagnostic used for density measurements which has sufficient spatial and temporal resolution for the study of turbulent density fluctuations and associated flows. A high energy neutral beam consisting of hydrogen isotopes or light alkali metal atoms is shot...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1022.pdf
Low frequency waves turbulence developing in magnetized plasma columns are well known to trigger important radial transport, a major issue for fusion devices [1]. We present here analysis from very fast imaging of low frequency waves in a magnetically confined plasma column, as well as concomitant measures of radial...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1025.pdf
Globus-M2 [1] is a new generation one-Tesla compact spherical tokamak with two 1 MW neutral beam injectors and 0.5 MW ion cyclotron resonance heating system. Additionally Globus-M2 is equipped with a set of new diagnostics, suitable for fast ion studies, including scanning two-neutral particle analyzer system, neutron...
Seee full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1027.pdf
Reliable and quantitative modelling of the behaviour of fast ions is an essential step in the ITER scenario development because of their important contribution to the plasma energy balance. The fast ion distribution strongly depends on various factors, in particular, on plasma MHD activity and on sources of plasma heating...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1028.pdf
A newly installed 1 MW 25 keV NBI (2016) combined with the ECH-ECCD system allow the TCV machine [1] to join the on-going worldwide (DIII-D, AUG, TJ-II, etc.) research for studying wave fast ion interaction phenomena of interest for burning plasmas, an important point for ITER and DEMO. Alfvén modes were observed on the...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1029.pdf
Fast ions play an important role in the heating of Tokamak plasmas, e.g. by NBI (Neutral Beam Injection) and other sources. Numerical particle trackers are employed to simulate huge numbers (often of the order of millions) of trajectories of fast ions in Tokamaks. Such simulations can require high numerical accuracy and...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1032.pdf
The dependence of equilibrium properties obtained by the EFIT Grad-Shafranov equation solver on constraining input data was studied. Following sets of constraining data were supplied to EFIT: (i) minimal input (16 internal partial Rogowski coils), (ii) optimized minimal input (16 internal partial Rogowski coils with...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1033.pdf
The equilibrium solution of the GradShafranov equation in the form of the 2D function of psi and of the F() = R Btor function and the pressure p() profile offers fundamental information about the tokamak plasma state. The combination of these functions provides complex information about the plasma such as the topology,...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1038.pdf
RFX-mod is a Reversed Field Pinch device that allowed performing experiments in regimes with a plasma current up to 2 MA. Due to its low value of the safety factor (q<<1) and the central peaking of current density, the RFP is characterized by the presence of MHD modes that, in RFX-mod, are controlled by a combination of a...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1039.pdf
Zonal flows (ZF) are low-frequency, predominantly electrostatic plasma oscillations ( is the poloidal wave-number, is the toroidal wave-number) widely
observed in modern toroidal magnetic plasma confinement systems, such as tokamaks and stellarators [1]. It is believed that ZFs are able to regulate the level of anomalous...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1040.pdf
Determination of vessel currents magnitudes and distribution plays crucial role in understanding of mechanical loads on the machine [1]. Asymmetrical disruptions are of particular concern because they possibly cause severe asymmetric electromagnetic loads [2, 3]. For the first time plasma current asymmetries are compared...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1041.pdf
Magnetic plasma confinement systems with conductors embedded into plasma is an important class of magnetic traps with high beta, known as Galateas [1], alternative to the mainstream toroidal system designs. As summarized in [2], Galateas are widely diversified and it provides additional reason to consider them, unlike...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1042.pdf
The Spherical Torus (ST) is a promising candidate for an advanced fusion reactor due to the compactness. Elimination of the central solenoid coil to allow an approach to lower aspect ratio configurations requires for the non-inductive plasma start-up. The transient coaxial helicity injection (T-CHI) is a leading...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1043.pdf
Single and compound helicity tearing mode (TM) responses to a rotating 3D resonant magnetic perturbation (RMP), in the presence of a static error field (EF), have been observed in the partially penetrated regime [1] of the TM unlocking bifurcation process [2] in DIII-D experiments. This regime has been proposed as a stable...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1045.pdf
The massive injection of material into a tokamak is a technique considered for disruption mitigation. Presently, several shattered pellet injectors (SPIs) [1] are foreseen for the ITER disruption mitigation system. According to reference [2], the assimilation of 14 kPam3 of deuterium fully prevents the conversion of...
See full abstract herer
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1046.pdf
In tokamak-reactor, such as ITER, the generation of runaway electrons (RE) is unacceptable. Disruption Mitigation System (DMS) designed in ITER should be a reliable tool for suppression of RE and mitigate other detrimental consequences of disruptions. Elaboration of the RE database and its comprehensive analysis should...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1047.pdf
Theoretical and experimental considerations [1] suggest that axisymmetric perturbations that are resonant at the X-point(s) of a magnetic divertor separatrix may play a role for the understanding of ELMs and their active control via "vertical kicks" [2] in tokamaks.
We present the first step in the development of an...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1048.pdf
It is well known that the ideal MHD cannot describe the resistive wall mode (RWM) dynamics in the DIII-D tokamak [1, 2]. This is true, in particular, with respect to the rotational stabilization [1] that makes plasma stable essentially above the no-wall stability limit predicted by the ideal MHD. The uncertainty in the...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1049.pdf
In this study, we analyzed current quenches in 3 types of DIII-D disruptions (low-q, error field and shell pellet injection) to investigate the determination mechanism responsible for the initial phase of current quench in DIII-D tokamak. Disruptions are one of the most critical issues for realization of DEMO reactor....
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1051.pdf
Nonlinear dynamics of plasma termination events in stellarators are studied using a 3D nonlinear MHD simulation code. In this study, two types of plasma termination events, which are MHD instabilities driven by the pressure gradient and plasma current, are studied, respectively. In the Large Helical Device (LHD)...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1053.pdf
One of the major threats for the integrity of future fusion devices are disruptions [1], i.e. events during which the plasma energy content is lost on a very fast time scale and can be released under various forms to the structures circumventing the plasma. Consequently, significant heat
loads, particle loads,...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1054.pdf
Geodesic acoustic modes (GAMs) of a global character are frequently observed in tokamak plasmas. While many aspects of GAMs require a kinetic treatment, the MHD model offers a suitable framework for analytically studying various global aspects of these modes, including higher-order effects of plasma shaping, plasma flows,...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1055.pdf
Energetic electrons, which are foreseen to be produced during disruptions in ITER, represent a potentially dangerous threat for plasma facing components [1]. Therefore, behaviour of runaway electron (RE) beams has been studied at the COMPASS tokamak in the frame of dedicated experiments focused on their generation and...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1056.pdf
For the first time diamagnetic measurements were used to calculate poloidal current in the tokamak vacuum vessel during thermal and current quenches as was recently proposed in [1]. The experimental results are compared with analytical predictions [2] and numerical modelling with CarMa0NL code [3] considering the wall...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1057.pdf
Combining with the data of the three-wave Polaris-interferometer system (Polaris), the Soft Xray array system (SXR) and the electron cyclotron emission system (ECE), it is observed that the radial transport in the region between reversed radius and mixing radius is asymmetrical, which is related to the phase of the...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1059.pdf
Corrugations of tokamak magnetic flux surfaces in the location of a kink mode and/or around the islands created by a tearing mode introduce in combination with toroidal magnetic field inhomogeneity 3D modulations of magnetic field strength within the perturbed flux surfaces and, respectively, give rise to non-ambipolar...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1060.pdf
Small scale turbulence widely treated as one of the causes of abnormal transport genesis. The variation of the turbulence amplitude at T-10 is correlated with the variations of the particle flow mainly [1]. The enhanced heat transport with quick reduction along the time was observed during "ballistic" stage and typical...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1061.pdf
RFX-mod (R = 2 m, a = 0.459 m) is the largest Reversed Field Pinch experiment which allowed characterizing the RFP plasmas up to currents of 2MA. Improved plasma performances are obtained when, in the resonant part of the m=1 spectrum, one dominant Tearing Mode is much higher than the other secondary ones (Quasi Single...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1062.pdf
Advanced plasma confinement in open magnetic mirrors features high relative pressure ( Beta about 60%), mean energy of hot ions of 12 keV and the electron temperature up to 0.9 keV in quasistationary regime [1]. In modern concepts simple mirror ratio of ~1520 and improved longitudinal confinement are proposed [2, 3]....
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1063.pdf
The GOL-NB project is a physics demonstration experiment on multiple-mirror plasma confinement that is currently under development in the Budker Institute of Nuclear Physics [1]. The final configuration of the device will include a 2.5-m-long central gasdynamic trap with two attached multiple-mirror sections of 3 m each,...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1064.pdf
Microwave gyrotron beams play an important role in magnetically confined fusion plasmas due, in particular, to the electron cyclotron (EC) frequency typically being in that range. EC resonance heating (ECRH) is a popular method of heating the plasma to thermonuclear temperatures, especially for non-inductively driven...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1065.pdf
Compact device with an Ultra-Low Aspect Ratio Tokamak plasma (CULART) is proposed. The major objective of CULART is twofold. First, to explore very high beta (VHB) limits (~ 1) via passive stabilization under relatively low toroidal field (TF). Secondly, as a proof-of-concept, to use these VHB plasmas as a target for...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1069.pdf
The presented work is part of the fundamental research on the implementation of a controlled thermonuclear reaction in open-type magnetic traps. The interest in such systems is defined by the development of powerful neutron sources, which are necessary, in particular, to control hybrid fusion-fission reactors, and, with...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1074.pdf
Full-wave analysis including kinetic effects of plasmas has been extensively employed in studying wave heating and current drive in tokamak plasmas. Most of previous kinetic analyses of wave propagation and absorption in an inhomogeneous plasma are based the wave number.
The dielectric tensor in a hot plasma has been...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1076.pdf
A while ago it was revealed theoretically [1,2] that in presence of a non-monotonic plasma density profile, originating due to the magnetic island or the density pump-out effect at onaxis electron cyclotron resonance heating (ECRH), the low-power-threshold absolute twoupper-hybrid (UH)-plasmon parametric decay instability...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1077.pdf
The ITER ICRF system is designed such that there is a 90 degree phase shift in the currents between the upper and lower rows of antenna straps. The consequences of this design has previously been studied from the point of view of the coupling, but not with respect to plasma heating. In this work the effects of poloidal...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1079.pdf
Ion Cyclotron Resonance Frequency (ICRF) heating is one of the three auxiliary heating methods foreseen for ITER. The ICRF scenarios in ITER have been recently reassessed with emphasis on the heating and current drive performance and H-mode access capabilities [1,2] based on simple one-dimensional wave damping...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1080.pdf
Investigations of lower hybrid heating (LHH) of plasma ion component very wide and active in 70th and 80th did not result in development of a reliable heating scheme. Excitation of parametric decay instabilities accompanied by ion acceleration observed at different tokamaks at densities exceeding a certain threshold...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1082.pdf
We have assessed the possibility of using the finite element method to solve the electromagnetic wave equation in a fusion plasma in 3D for ICRH applications. In particular, we have studied on-axis hydrogen heating and second harmonic deuterium heating. The purpose of this code is to develop a 3D model with more...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1083.pdf
In tokamak plasmas, electron Bernstein (EB) waves mode-converted from X waves at the upper hybrid resonance (UHR) layer propagate toward the higher field side and are cyclotron-damped away at Doppler shifted frequency before arriving at the electron cyclotron resonance (ECR) layer. Resulted power deposition profile...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1084.pdf
The first plasma on the new spherical tokamak Globus-M2 [1] was obtained in the spring of 2018. During the test experimental campaign, the routine Globus-M shot with moderate density, current of 0.2 MA and magnetic field of 0.5 T [2] was reproduced. The main discharge parameters were monitored using routine...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1086.pdf
The development of non-inductive current drive methods is a central problem on the way of a fusion reactor development within the tokamak concept. The low-hybrid (LH) method of current maintenance can potentially be used in solving this problem, since it has one of the highest efficiencies of current drive [1]. This...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1088.pdf
The choice of available auxiliary heating and current drive schemes is limited in spherical tokamaks (STs) due to tight aspect ratio, low toroidal magnetic field, and high plasma density approaching the Greenwald limit. The most successful heating and current drive method used to date in STs is Neutral Beam Injection...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1090.pdf
Ion Cyclotron Range of Frequency (ICRF) Heating is an important heating source on the Joint European Torus (JET). For the D-T campaign, various scenarios of ICRF heating are considered including second harmonic Tritium resonance and the three species hybrid resonance method [Y. Kazakov et al, Nature Physics 973 13...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1091.pdf
Runaway beam confinement and dissipation remain one of the main concern for ITER operation and a clear solution has not been found yet. ITER will be provided with a Shattered Pellet Injection (SPI) system as the primary disruption mitigation technique given the promising results provided by DIII-D [3]. To further...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1093.pdf
Since the suggestion that magnetic islands produced by tokamak tearing modes might be stabilized by non-inductive currents [1], a great number of experimental, theoretical, and computational efforts have been exerted. The stabilization effect relies upon rf waves driving current preferentially at the island center....
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1095.pdf
The paper deals with plasma controllability and reachability regions in the spherical tokamak Globus-M (Ioffe Inst.). Plasma magnetic control system [1] of Globus-M consists of 2 loops for plasma vertical Z and horizon R position control with thyristor current invertors [2], and 6 inner cascades for control of...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1096.pdf
In ITER, only a limited number of actuators is available to carry out a great variety of control tasks, some of which may be closely coupled. Safe operation while attaining high plasma performance will require an integrated Plasma Control System (PCS) that has the capability of simultaneously regulating as many...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1097.pdf
Developing attractive means of initiating current without using magnetic induction from a central solenoid is a critical scientific and technical challenge facing the spherical tokamak (ST). The PEGASUS program has focused on developing the physics basis and predictive models for non-solenoidal tokamak startup using...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1098.pdf
This paper describes characteristics of plasma inductive start-up in the spherical tokamak Globus-M2. The Globus-M2 [1] is the result of Globus-M upgrade, based on the replacement of toroidal and poloidal magnetic coils in order to increase the toroidal magnetic field and the plasma current by 2-2.5 times up to B_T =...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1099.pdf
A study of the vacuum magnetic field produced by the Poloidal Field (PF) coil system of ASDEX Upgrade is presented. In the model both coils and their powersupply feedthroughs are considered. The latter contribute to the error fields (EFs) that have already been observed and reported in [1, 2]. The effect on the B...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1101.pdf
Spontaneous toroidal flows have been observed during ECH without direct momentum input in tokamak and helical plasmas[1-3]. We have studied the j × B toroidal torque due to radial diffusion of suprathermal electrons during ECH in LHD applying GNET code[4]. It is found that the j × B torque related to the suprathermal...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2006.pdf
In indirect drive inertial confinement fusion (ICF), a high-Z enclosure (or "hohlraum") surrounds a low-Z capsule containing DT fuel. Laser beams irradiate the interior of the hohlraum, creating an x-ray radiation bath that compresses the fuel to ignition conditions. Motion of the irradiated hohlraum wall induces...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2009.pdf
It has been suggested that crossing two electron beams within the fusion plasma may increase the energy transfer to the fuel, improving heating of the fuel and possibly pushing the hot-spot over threshold for ignition. The interaction and its dispersion relation were first derived in a theoretical study by Ratan et...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2010.pdf
Laser-driven ion acceleration is a long-standing topic of great appeal in the field of laserplasma interaction, both because of the rich physics at play and the foreseen applications [1]. Various laser-ion acceleration mechanisms have been identified in the literature. Among them, Target Normal Sheath Acceleration...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2011.pdf
The need for higher energies in particle colliders led to the development of several types of particle accelerators, like plasma-based accelerators as a promising concept. The achievable electric fields in a plasma in the order of GV/m [1] exceed by orders of magnitude the conventional electric field generation by RF...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2014.pdf
A discussion have been made to demonstrate travelling wave solution for nonlinear relativistic electron plasma wave excited by an intense proton beam. The structures of the excited wake wave electric field and the perturbed plasma electron fluid density are obtained by considering a rectangular proton beam source....
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2016.pdf
Recently, Pisani et al. [1] have shown the possibility of generating nearly single-cycle (less than 4 fs) propagating surface plasmons at the micro-structured surface of a grating target by a laser pulse with wavefront rotation. Since the surface plasmon can be excited when the grating is irradiated at a specific...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2018.pdf
The interaction between relativistically intense lasers and near-critical plasmas is a rich field of study, both for basic and applied science, e.g. providing the possibility for producing singularly intense and short XUV bursts of radiation. There are several models describing the highly complex and nonlinear...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2019.pdf
With the latest advances in laser science, the need to produce superior quality ion and electron beams has been a hot research field in the past decade. The hot electron density and temperature in the rear vacuum depend on the target geometrical and composition properties such as target curvature, pulse focusing...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2024.pdf
Not all key questions in fundamental physics can be readily investigated using conventional high-energy particle collider technology. In particular, alternative methods are required to search for novel low mass particles with very weak coupling to ordinary matter. It is anticipated that the next generation of...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2025.pdf
Experimental results related to soft X-ray (SXR) radiation generated during a head-on collision of two low-temperature plasma flows immersed in a longitudinal magnetic field are presented. The plasma flows with velocities of (2-4)x10^7 cm/s and energy contents of 70-100 kJ were produced in these experiments by a pair of...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2026.pdf
When an ultra-intense, femtosecond laser irradiates a solid target, an over dense plasma is generated at the target surface, acting as a non linear reflective media for the incident laser (known as a plasma mirror) that reflects the incident fields and emits a train of attosecond pulses of X-UV radiation . For ultra-high...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3002.pdf
This work presents a numerical simulation of the Penning discharge in 2D/3D formulation. The simulation is based on the electrostatic Particle-In-Cell (PIC) method using structured rectangular grids and implemented in the VSim [1] software package. To simulate the kinetic processes in a gas-discharge plasma, the...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3003.pdf
The use of the Electron Cyclotron Resonance (ECR) for electron heating for Magnetic Nozzle (MN) thrusters have recently received increased interest, as they have been shown (Cannat et al, Phys. Plasmas, 22, 053503 (2015)) to provide improved thrust efficiency up to 16% at only 30 W input power. Such performance make such...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3004.pdf
A one-dimensional kinetic model of an inverted sheath [1] is presented. The model is based on a bounded plasma system model, introduced by Schwager and Birdsall [2]. A onedimensional bounded plasma system is considered. The system is bounded by two very large planar electrodes perpendicular to the x axis. The left hand...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3005.pdf
Any future space missions involving people on board must solve the problem of oxygen required for life support. In the case of Mars oxygen is not present in the rarefied atmosphere. We suggest a possible approach to solve the oxygen problem for Mars missions by the use of a high power coaxial plasma gun to split the...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3006.pdf
Interest in dielectric barrier discharges (DBD) for plasma actuators has seen an important growth in the last years. A barrier discharge occurs when an alternating high voltage is applied to conductive electrodes, at least one of them covered with a dielectric layer, allowing only the passage of the displacement current....
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3007.pdf
Monitoring the fuel content in plasma-facing components is essential to get a detailed understanding of the plasma-wall interaction. Laser-induced material analysis is frequently used in fusion devices [1, 2], but there is a lack of diagnostics which can provide depth resolved and quantitative information when no...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3009.pdf
Thermochemical and radiative transfer processes in a shock layer should be clarified to develop a future space vehicle because of their affecting the aerodynamic forces and heating rates. Although the two-temperature model has been utilized widely for a long time, the accuracy of the reaction rate coefficients might be...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3010.pdf
Atmospheric pressure plasma jets (APPJs) today serve as a tool for treating various surfaces from metals to polymers and biological tissues sensitive to temperature [1]. Adhesion, hydrophilic and bacteriostatic properties of the surface can be changed under plasma treatment. The latest studies showed that not only the...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3011.pdf
Inductively coupled plasmas (ICPs) are a widespread and versatile radio frequency (RF) driven plasma generation technique. Thus, significant efforts have been made to optimize them according to the individual requirements at hand. The analysis of the RF power transfer efficiency - or analogously of the plasma equivalent...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3014.pdf
This contribution describes an interesting phenomenon concerning the interaction between a non-equilibrium low-pressure radiofrequency plasma and aggregated particles injected into it. This phenomenon is related to the particle de-agglomeration when they are injected in a plasma. In order to develop nanoparticle...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3014.pdf
METU Plasma Research Laboratory microwave plasma torch is a high power (up to 2kW) microwave source operating at 2.45 GHz via a surfaguide waveguide. Argon gas is fed from one end, the plasma column generated inside a 20 mm diameter quartz tube comes out as a high-speed continuous jet from the other end. Due to its...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3015.pdf
Large attention is nowadays devoted to the understanding of the activation of CO_2 by cold plasmas in different conditions (MW, DBD, nano-pulsed discharges). Theoretical efforts are being developed to better understand the electrical conditions necessary for maximizing the CO_2 dissociation process [1-2]. In particular,...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3016.pdf
MW assisted hydrogen methane plasmas have been extensively used for growth of CVD diamond and graphene. In this article, we discuss the results of self-consistent simulation of hydrogen-methane plasmas in a microwave resonating cavity over wide range of operating conditions (25-200mbar) and different concentrations of...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3017.pdf
It is essential to know discharge propagation velocity dependences on various operational parameters as for understanding of discharge development physics as for applications. This applies as well for self-non-self-sustained (SNSS) discharges [1] in subthreshold microwave fields. For microwaves at wavelength λ = 2 cm it...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3018.pdf
Spectral investigations were carried out on a cathode system, consisting of two concentric spherical hollow grids with aligned orifices to diagnose Complex Space Charge Structures (CSCS) bordered by an electric double layer. CSCS in form of a single or multiple quasi-spherical luminous plasma bodies are called fireballs,...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3019.pdf
Hollow cathode discharge is able to generate a high density plasma inside the hollow cathode cavity [1]. To develop a small sized electron beam source with a high current and high durability, the hollow cathode discharge is applied to an electron source for the high current electron beam in this research. The schematic...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3020.pdf
An analytical study on the space-time evolution of normal electrostatic modes in warm multicomponent plasma is presented. Multi-component plasma can be comprised of electrons, ions, dusts etc. Immobile dust grains can be either positively or negatively charged. [1] In this work, they are considered to be distributed...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.4001.pdf
The dynamics of a pure electron plasma confined by strong magnetic fields in a Malmberg-Penning trap is analogous to the vortex flow in an inviscid two-dimensional fluid. In fact, in the guiding-center approximation the transverse electron evolution is dictated by the drift-Poisson equations which are isomorphic to the...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.4004.pdf
The formation of the ambipolar potential profile in a plasma flow expanding from a mirror magnetic trap is a challenging problem in plasma physics [1-6]. Here we focus on a particular case of non-equilibrium plasma with hot electrons expanding from a gas dynamic trap that is important for a number of applications [7-10]....
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.4005.pdf
The skin effect is the basic mechanism which governs the distribution of the electromagnetic field as well as of electron heating and power absorption in the ICP plasma. Recent interest in ICPs operating at low gas pressure (0.1-50 mTorr) has prompted intensive studies of the anomalous skin effect - mechanisms of the...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.4006.pdf
The control of plasma potential profile in plasmas is crucial for various applications ranging from space propulsion [1], the development of plasma centrifuges [2] or the mitigation of turbulent transport by sheared flows [3].
We report here a detailed experimental investigation of the plasma potential control using...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.4007.pdf
Magnetic nulls in 3 dimensional fields appear in the solar corona, in planetary fields and in fusion concepts such as the polywell and Field Reversed Configuration (FRC). These points where the field vanishes are topologically stable and are hotspots for magnetic reconnection. We analyze these nulls, their motion and...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.4009.pdf
The Biermann battery [1], driven by the perpendicular temperature and pressure gradients, is often dominant source of magnetic fields generated in laser-plasma experiments. A detailed study of Biermann generated magnetic fields in collisionless systems has been carried out [2] in an expanding plasma bubble, showing that...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.4010.pdf
Within the framework of MagnetoHydroDynamics, a strong interplay exists between flow and magnetic fields. This interplay is known to lead to several interesting phenomena such as nonlinear non-dispersive Alfven waves, recurrence phenomena and magnetic re-connection, to name a few. Using a set of divergence free...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.4011.pdf
Self-organized criticality (SOC) is a well-known paradigm for explaining power law probability distributions and frequency spectra in astrophysical, space and laboratory plasmas [1, 2]. By contrast, in the scrape-off layer of magnetically confined fusion plasmas and other turbulent systems, probability distributions with...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.4013.pdf
A system of the modified quantum fluid equations has been used for the investigation of Alfven wave dispersion properties in a non-ideal astrophysical plasma medium. The dispersion relation is derived by perturbation method in the presence of dissipative effects, self-gravitational, quantum potentials and electromagnetic...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.4015.pdf
We present modelling a dynamical spectrum of a host star's cyclotron emission which came through a magnetically active (auroral) region of a planetary magnetosphere. The model for the local planetary emission is based on a horseshoe-type cyclotron instability [1,2]. A full electromagnetic modelling of a signal which...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P4.4016.pdf
We suggest and investigate in detail an analytical model of a quasi-stationary current sheet in a collisionless plasma describing the boundary of a magnetosheath formed by the solar (stellar) wind [1]. The model significantly expands the scope of the magnetohydrodynamic approach and is based on a consistent kinetic...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I4.403.pdf
Rapidly rotating neutrons stars and black holes are the central engines of some of the most extreme astrophysical phenomena such as gamma-ray bursts, pulsars, X-ray binaries, binary mergers or active galactic nuclei. The activity of these compact objects is often associated with the creation and the launching of a...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I4.104.pdf
The operation of future high-power density fusion reactors such as ITER and DEMO requires avoiding damaging plasma-facing surfaces and good core confinement. The former requirement necessitates operating in the detached divertor regime, and the latter is met by operating in the high confinement (H-) mode. Recent...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I4.106.pdf
Recent advances in shattered pellet injection (SPI) in the DIII-D tokamak have led to improved understanding of several critical issues for the ITER Disruption Mitigation System. Infrared thermography shows elevated thermal quench heat loads indicative of radiation asymmetries peaked near the injection source. However...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I4.204.pdf
Newly constructed laser facilities such as ELI NP and ELI Beamlines are expected to deliver unprecedented laser intensities, making it possible to probe new regimes of light-matter interactions in laboratory conditions. One such regime is where a laser-irradiated solid material becomes relativistically transparent and...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I4.404.pdf
Understanding the transport of charged particles in the Galaxy is fundamental to solve the mystery of the origin of Galactic cosmic rays (CR) and to asses their role in several Galactic processes. Recent results from direct experiments, especially AMS-02 and PAMELA, are revealing a fine structure in the CR spectrum...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.105.pdf
A comprehensive diagnostic set compared against 2D modeling has provided new insight into energy transport and dissipation processes in detached plasmas and their scaling to future devices. Experiments and modeling reveal a detached divertor plasma dominated by plasma convection from the X-point towards the target....
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.206.pdf
Despite being one of the most basic process of quantum electrodynamics (QED), and being responsible of the universe opacity to high energy photons [1], the electron-positron pair production by two photons collision (gamma-gamma -> e-e+, linear Breit-Wheeler [2] process, LBW) has never been observed directly in the...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.401.pdf
The recently developed theory of the Spectral Web [1, 2] is a method to compute the full complex spectrum of stationary plasmas together with a connecting structure. This permits to consider the enormous diversity of MHD waves and instabilities of rotating tokamaks and astrophysical plasmas from a single unifying view...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.110.pdf
Disruptions are one of the fundamental issues to be tackled in future tokamaks [1], due to significant eddy and halo currents in the conducting structures producing substantial electromagnetic forces and torques thanks to the interaction with the magnetic field. It is hence fundamental to have reliable modelling tools...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.207.pdf
When an ultra-intense laser pulse interacts with plasma, the accelerated electrons experience the back-radiation reaction due to the emission of electromagnetic radiation, and this has recently been experimentally evidenced [1]. The results suggest that both the quantum and classical nature of the back-radiation...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.402.pdf
Cosmic rays are charged particles, moving at relativistic speeds after being accelerated through interaction with astrophysical shocks. This process, known as diffusive shock accleration, or Fermi acceleration, involves the particle repeatedly crossing the shock, picking up speed each time it is reflecte by the local...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.111.pdf
The growing need for a fundamental understanding of complex MHD phenomena in diverted tokamaks requires the development of more sophisticated and highly demanding codes. The numerical MHD code JOREK-STARWALL is adapted and applied to the simulation of free-boundary instabilities. The investigation of this type of...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.403.pdf
The properties of magnetohydrodynamic (MHD) turbulence have significant implications for astrophysical phenomena like cosmic ray scattering. We study properties of MHD modes by decomposing data of MHD simulations into linear MHD eigenmodes - namely the Alfvén, slow, and fast modes. Some earlier studies have shown the...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.108.pdf
In recent years the focus of tokamak fusion research onto power exhaust increased showing that first wall power load is one of the major challenges in realizing a power plant. Unmitigated divertor power loads in next step fusion devices like ITER are projected to exceed material limits making significant impurity...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.404.pdf
Observations recorded from NASA's Van Allen Probes have revealed the prevalence of a broad spectrum of Alfvénic field fluctuations in the inner magnetosphere. The properties of these waves in the inhomogeneous plasma of his region of near-Earth space give rise to a number of resonant and non-resonant interactions...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I5.012.pdf
Nanostructured materials are revolutionizing many fields of science and technology and are finding their way in many commercial products. Their interest is due to the fact that nanostructured films present functional (tribological, biological, electrical, optical) properties which are new, or of superior quality,...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I5.201.pdf
The production of high-quality electron bunches in Laser Wake Field Acceleration [1] relies on the possibility to inject ultra-low emittance bunches in the plasma wave. A new bunch injection scheme (Resonant Multi-Pulse Ionization, ReMPI) has been conceived and studied in which electrons extracted by ionization are...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I5.301.pdf
This contribution reviews recent activity of the Padova group on the use of helium plasmas in plasma medicine. Following the initial emphasis on disinfection of the cornea [1], the research activity has developed along several research lines, which cover the topics of wound healing, cancer treatment and non-thermal...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I5.102.pdf
Lausanne, Switzerland An extensive study of quasi-axisymmetric equilibria has been conducted, from which a highly promising magnetic field design has been found by exploiting ROSE (Rose Optimizes Stellarator Equilibria) [1] - an optimization code for 3D magnetic plasma equilibria. The results of this design study and...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I5.202.pdf
Modern laser technology and the realization of high-intensity, short-pulse laser systems using Chirped-Pulse Amplification has led to the development of novel laser-based acceleration schemes. For high-intensity, picosecond duration pulses, where the pulse duration exceeds the plasma period, the laser pulse will expel...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O5.401.pdf
In 2023 the first element of a new international space station is to be launched. The Lunar Orbital Platform-Gateway (LOP-G), or Deep Space Gateway (DSG) will orbit the Moon rather than the Earth [1]. The purpose of the Gateway is to acclimatise crew and technology for long durations and radiation exposure of deep-space...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O5.402.pdf
Astrophysical plasmas are ubiquitous and differ from laboratory plasmas in key aspects. They are typically cold (k_B T<<m_e c^2), collisionless, and usually contain relativistic sub-populations. To study the evolution of such plasmas, it is necessary to employ a fully kinetic treatment.
Particle-in-cell (PIC) algorithms...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I5.J601.pdf
Filaments detaching from the edge of tokamak plasmas are well known. They are generated by pressure driven instability and driven outward by polarization due to the magnetic field curvature and gradient. Similar structures are also commonly observed in the edge and island divertor of the Wendelstein 7-X stellarator....
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O5.101.pdf
WEST is a full tungsten (W) superconducting tokamak with a major radius of 2.5 m, an aspect ratio of 5 and a nominal magnetic field of 3.7T. WEST programme aims at power exhaust studies on the ITER-like actively cooled tungsten divertor and at bulk plasma performance in discharges reaching 1000s.
So far up to 5.3 MW of...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O5.201.pdf
We present modeling and experimental results concerning the guiding of relativistically intense laser pulses with peak power of 0.85 PW over a distance of 15 diffraction lengths. Laser guiding was achieved by increasing the focusing strength of a capillary discharge waveguide using laser inverse Bremsstrahlung heating....
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O5.301.pdf
The electromagnetic rail accelerators (railguns) with plasma armature are an interesting object for the plasma physics. The acceleration of the plasma (or a solid body ahead of plasma armature) in railguns are due to electromagnetic interaction of the electrical current in plasma and magnetic field (generated by current...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O5.102.pdf
Ion Cyclotron Resonance Frequency (ICRF) heating is one of the auxiliary heating methods which will be used in ITER. A detailed assessment of ICRF schemes available in the non-active phase of ITER operation was recently carried out [1]. As a result, the ICRF scenarios considered for ITER also include the so-called...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O5.202.pdf
Intense, ultra-short electromagnetic pulses are enabling applications such as the control of motion in solids and the observation of reaction dynamics at the electronic level. While both high-intensity and carrier envelope phase (CEP) tunability are crucial, they are hard to obtain with current methods. Laser-plasma...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O5.302.pdf
At present, the THz frequency range is still the least studied from the point of view of gas discharge physics. The study of the discharge, sustained by the powerful focused beams of THz radiation, has become possible recently due to the development of powerful sources in this range (FELs and gyrotrons) and is of...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I5.J602.pdf
Tokamak plasmas are examples of complex systems where multiple spatial and temporal scales are intrinsically linked. Microturbulence, meso-scale zonal structures (ZS, like zerofrequency zonal flows and geodesic acoustic modes) and macroscopic MHD instabilities like Alfvénic modes (AM), mutually interact either due to...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O5.203.pdf
We demonstrated efficient electron acceleration in the plasma channel with injection through the breaking of plasma waves generated by parametric instabilities. It was shown experimentally that in the case of optimal preplasma parameters femtosecond laser pulse with an intensity of 5x10^18 W/cm^2 and an energy of 50 mJ...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O5.303.pdf
Multiple complex space-charge structures in unmagnetized low temperature plasmas, such as fireballs or inverted fireballs, arise from ionization phenomena near electrodes or due to local constraints [1,2]. The generation of such complex space-charge structures is often accompanied by plasma instabilities. [3,4]....
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http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1002.pdf
The forthcoming device JT-60SA, under construction in Naka (Japan), is particularly well equipped for studying Advanced Tokamak scenarios with high N and a non-negligible fraction of energetic particles from neutral bean injectors [1][2]. These plasmas are prone to exhibit kink-like ideal MHD instabilities; one or more...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1003.pdf
Disruptions are one of the major concerns in ITER and other future tokamaks [1]. In addition to heat, particle flux, and energetic electrons impacting the first wall, significant electromagnetic loads will arise, due to the interaction of eddy and halo currents in the conducting structures with the magnetic field....
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1011.pdf
Predicting plasma performance is an essential activity for assessing future campaigns in present day tokamaks as well as in future devices as ITER or JT-60SA. In particular, predictions for the ramp-up phase are of special importance, as successful plasmas in the flat-top phase critically depend on the initial...
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1012.pdf
The parametric Operational Space (OS) for Steady-State (SS) operation [1] in ITER has been reassessed by global analysis taking into account the baseline design of the Neutral Beam Injection (NBI) and EC H&CD systems and their foreseen upgrades (up to P_NBI = 49.5 MW and with P_EC = 30 MW, where up to 40 MW upgrade is...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1014.pdf
With the aim of finding and validating reduced models able to reproduce the relevant features of the energetic particle interacting with the Alfvénic spectrum, we define a mapping procedure (based on the resonance rule) between the reduced radial profile of the burning plasma scenario and the velocity space of the...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1016.pdf
The neoclassical impurity transport in the pedestal region of a tokamak plasma is studied with non-local guiding center particle simulations, employing the code HAGIS with a Monte Carlo collisions model. The simulations are done in two steps, assuming the trace limit for the impurity ions. First the parallel velocity of...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1017.pdf
I-mode is a naturally ELM-free improved confinement regime which exhibits high energy confinement and a temperature pedestal, but low particle confinement and a density profile similar to L-mode [1]. The weakly coherent mode (WCM) occurs in the pedestal region of Imode plasmas at both ASDEX Upgrade (AUG) and Alcator...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1019.pdf
Sustained ELMy H-mode operation at high heating power (~ 32 MW) in JET-ILW requires gas puffing to control radiation from high-Z impurities (W, Ni) by increasing their rate of removal by ELMs, as well as core ICRH heating to mitigate their accumulation and sweeping of the strike points to avoid overheating of the target...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1020.pdf
Edge transport barrier (ETB or pedestal) regime is often associated with transient relaxations (Edge Localized Modes or ELMs) of the plasma. These periodic bursts of particles and energy can significantly erode and damage the materials (eg. Tungsten, W) of the tokamak vessel. Any high-Z impurities remaining confined in...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1022.pdf
The High confinement mode (H-mode) edge pedestal, a narrow region (~1.5 cm width) with steep pressure gradient just inside the last closed flux surface, is prone to various instabilities. Instabilities include intermittently occurring Edge Localised Modes (ELMs) but also other more continuous modes that occur in between...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1023.pdf
Recent results on DIII-D show that low-field-side RMPs improve the robustness of discharges to high-Z impurity injection. Experiments were performed in H-mode ITER-baseline-shape discharges for three cases: 1. ELMy - q95 = 4.1, 2. RMP ELM-suppressed - q95 = 4.1, and 3. RMP with ELMs - q95 = 3.5. For each case above,...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1025.pdf
Dust in tokamaks is unlike to be mobilized prior to the beginning of plasma discharges, then dust presence in the vessel during the start-up phase of discharges is not considered an issue. Problems could arise due to the presence of magnetic dust [1,2,3] that are more likely to fly in the vessel volume during stat-up...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1027.pdf
Edge simulations until recently focussed on simulating only the scrape-off layer (SOL) and including appropriate boundary conditions to the numerical domain to mimic effects like the presence of a separatrix on the inner radial boundary. To a large extent, flux-driven 3D simulations have had considerable success in...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1031.pdf
Two of the biggest challenges for future fusion reactors are the power dissipation and erosion of diverter targets. Alternative configurations such as Snowflake [1] (SF) and the Quasi-snowflake family (QSF), including Two Null nearby divertor [2] (TNND), have the aim of controlling and optimising the magnetic flux...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1032.pdf
In magnetic confinement devices, boundary turbulence is responsible for transporting plasma and energy from the well-confined region towards the material surfaces where it can severely harm reactor relevant machines. It is therefore essential to develop a solid understanding of the mechanisms behind the transport in the edge...
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http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1035.pdf
The Small Angle Slot (SAS) divertor installed on DIII-D combines high closure with small incidence angle to achieve detachment over the entire divertor at low density. Experiments on DIII-D comparing divertor detachment and other divertor characteristics of the SAS configuration to an otherwise identical open divertor...
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1054.pdf
Wall conditioning in TJ-II, is regularly performed by Glow Discharge deposition of B films and Li evaporation from ovens located inside the vacuum chamber [1]. In order to tests in-situ, real-time conditioning techniques, a Nd-YAG laser (normally used for Laser Blow-Off studies [2] and LIBS [3]) is used to ablate lithium...
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1056.pdf
Cryogenic pellet injection (PI) is a well established fuelling tool used on most mediumand large-sized magnetically confined plasma devices. PI technologies are mature and such systems are earmarked as critical items for future reactors. Nonetheless, despite significant progress over recent decades, a complete...
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1069.pdf
The importance of the E × B flow shear in the transition from the low (L-) to the high (H-) confinement mode is well and widely appreciated [1]. At the edge of tokamaks, the E × B velocity profile shows two shear layers: the "inner" one is located within the confined region and is related to the ion pressure gradient while...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1088.pdf
The design of future fusion reactors and their operational scenarios require accurate estimates of the plasma confinement, which is a key parameter for the evaluation of the fusion performance. We are developing a new model that integrates different elements describing the main physics phenomena which determine plasma...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1094.pdf
Blob transport is subject to intense study in fusion energy research for the understanding and prediction of particle and heat fluxes onto the plasma-facing components (PFC) [1]. Blobs originate around the separatrix at the outer midplane, forming filaments which expand and propagate in the parallel and, respectively,...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1103.pdf
The RELAX device is a low aspect- ratio ( with R/a=2 where R and a are the major and minor radius of the torus) Reverse Field Pinch (RFP) in which on-axis resonant helical modes with m=1 and n=4 (m and n being the poloidal and toroidal mode numbers respectively) are observed during the so called Single Helical (SH)...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1105.pdf
The Divertor Tokamak Test (DTT) facility, which is under design for construction in Frascati (Italy), will produce neutron yield up to 1.3*10^17 n/s at full power (H-mode scenario). This calls for an accurate design and selection of the 2.5 MeV neutron diagnostic systems and detectors which can give the fill...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.2002.pdf
The results of plasma compression studies of nested wire and fiber arrays with current flowing through them are presented in this work. Experiments were made on the Angara-51 installation with current up to 4 MA. The current implosion of nested arrays represents a unique opportunity to simulate the interaction of a...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.2012.pdf
Hydrodynamic instabilities, such as the Rayleigh-Taylor (R.-T.) instability develop in high energy density, inertial confinement fusion (ICF) experiments. These instabilities degrade the implosion due to mixing of the fuel. We study R.-T. modes in ICF implosions in order to better understand how they evolve in time. To...
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.3006.pdf
One of the current nuclear industry problems is irradiated reactor graphite deactivation during decommissioning of nuclear power plants, as well as findings of effective method for decontaminating of nuclear power equipment internal surfaces sedimented with radionuclides from reactor water during operation. Important...
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.3013.pdf
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.4005.pdf
Within the linear response theory in the formulation of Zubarev [1, 2] the modification of electron-ion and electron-electron correlation functions is made with the account of local field corrections in the dielectric function [3]. Recently the Chebyshev polynomial expansion of the Fermi distribution functions was...
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.4008.pdf
Negative ion plasmas are observed in space and astrophysical environment (D and F layers of Earth's Ionosphere, Titan's atmosphere, Cometary comae) and in laboratory plasmas (e.g. plasmas processing reactors). In such plasmas, propagation of ion acoustic solitary waves have been observed experimentally in laboratory by...
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.4010.pdf
The magnetorotational instability (MRI) is a crucial mechanism of angular momentum transport in several astrophysical scenarios, like accretion disks around black holes [1]. The MRI has been widely studied using MHD models and simulations, in order to understand the behavior of astrophysical fluids in a state of...
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I5.015.pdf
Interplay between MHD and turbulence is interesting topics in magnetically confined plasma and solar plasma. The fast reconnection of magnetic field in the solar flare is well known but the mechanism is not well understood. Turbulence in the current sheet is a strong candidate to explain the fast reconnection in solar...
