See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1002.pdf
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1009.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...
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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...
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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...
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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...
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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...
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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/P2.1028.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...
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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...
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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....
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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...
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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...
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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...
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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)...
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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...
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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...
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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...
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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/P2.1086.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/P2.1094.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/P2.1096.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/P2.1101.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/P2.2003.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/P2.2020.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/P2.2024.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/P2.2026.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/P2.3001.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/P2.3005.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/P2.3017.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/P2.4002.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/P2.4007.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/P2.4012.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...
