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A.J. Creely (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1001.pdfSPARC 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...
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R. Goldston (EPS 2019)09/07/2019, 14:00MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1002.pdf
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M. Veranda (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1003.pdfThe 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...
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I. Mario (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1004.pdfThe neutral beam injection (NBI) system for the ITER experiment will be based on the production and acceleration of negative H/D ions. The ion beam requirements combine high accelerated current density (230 A/m2 in H, 200 A/m2 in D) with low core divergence (<7 mrad) and high uniformity over the extraction surface (better...
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R.J. Buttery (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1005.pdfFirst 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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J.W. Berkery (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1006.pdfDisruption 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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M. Ghasemi (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1007.pdfThe 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...
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S.D. Pinches (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1008.pdfThe 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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R.I. Khusnutdinov (EPS 2019)09/07/2019, 14:00MCF
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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... -
P.V. Minashin (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1010.pdfElectron 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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E. Perelli Cippo (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1011.pdfPresent 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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A.S. Kukushkin (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1012.pdfDEMO-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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P.F. Buxton (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1014.pdfTokamak 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...
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X. Chen (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1015.pdfWide-pedestal quiescent H-mode is characterized by a pedestal width exceeding the EPED-KBM limit and an Er profile that is shallower and broader than standard QH-mode or H-mode. This natural ELM-stable regime was first discovered when the NBI torque was ramped down from strong counter-Ip towards net-zero in high...
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R.J. Groebner (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1016.pdfRecent 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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S. Xu (EPS 2019)09/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1017.pdf
A serious challenge for high-power long-pulse operations of the tokamak is how to prevent damage to the plasma-facing components by particles from the edge plasma. Recently, a potential actuator to control the divertor flux distribution by using the synergy of the supersonic molecular beam injection (SMBI) and magnetic...
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M. Anastopoulos (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1018.pdfH-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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Q. Yu (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1019.pdfThe effect of externally applied resonant magnetic perturbations (RMPs) on the plasma current density gradient in the vicinity of resonant surfaces is investigated, based on two-fluid equations. In our paper we focus on m/n=4/2 or 6/3 RMPs. RMPs of moderate amplitude (~ 10-4 - 10-3 of the toroidal field) are found to be...
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H. de Blank (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1020.pdfThe 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...
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K. Lee (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1021.pdfUnderlying mechanisms of Bohm diffusion, E-field formation, and the suppression of turbulence have been remained unexplained for many years. The analysis of Gyro-Center Shift (GCS) is based on the ion-neutral collisions. GCS analysis provides a new perspective on how the electric fields can be generated and the particle...
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G. Hu (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1022.pdfEdge coherent mode (ECM), previously identified as the dissipative trapped electron mode [1], is commonly observed in the H-mode pedestal with a relative high collisionality in the EAST tokamak. This mode is considered contributing significantly to suppression of crash of large ELMs benefitting from the remarkable particle...
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F. Napoli (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1023.pdfThe EPED model [1] can predict the H-mode JET-ILW pedestal height and width within a relative error of about 20% when the pedestal is close to the Peeling-Ballooning (PB) boundary. However, when the pedestal is far from the PB boundary, our present understanding of the pedestal physics is still lacking [2,3]. Moreover, the...
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D.V. Borodin (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1024.pdfJET 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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A. Bortolon (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1025.pdfThe 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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D. Brida (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1026.pdfIn divertor tokamaks heat is flowing in a narrow channel of width q towards the divertor targets. Having a reliable extrapolation of q for ITER and DEMO is essential for the development of power exhaust scenarios, which led to the development of experimental multi machine scaling laws for q obtained from low edge density...
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L. Casali (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1027.pdfFirst 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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H. De Oliveira (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1028.pdfWe 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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A. Fil (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1029.pdfPlasma detachment needs to be achieved in ITER and future devices such as DEMO to dissipate most of the power in the Scrape-Off-Layer (SOL) and to reduce the particle flux reaching the divertor targets. To enhance our capability to improve current, and design future tokamaks, we must improve our understanding of the...
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M. Komm (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1030.pdfPartial detachment is the required regime for the baseline burning plasma scenario in ITER and next step devices, as it allows to convert the majority of the energy carried by charged particles through the scrape-off-layer (SOL) into isotropic radiation and thus avoids a localized heat flux deposition in the divertor...
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H. Kumpulainen (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1031.pdfhe 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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J. Lovell (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1032.pdfAlcator C-Mod measurements of the radiated power density profiles using resistive bolometry in high density (up to 3.2E20 m-3) Ohmic L-mode plasmas show elevated signal levels, up to 0.9MW/m2, outside the separatrix. Such near scrape-off-layer observations are not present at lower densities of up to 1E20m-3, and it is...
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J.H. Nichols (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1033.pdfMixed-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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M. Sala (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1034.pdfIt is well-known that to investigate plasma wall interaction in ITER-relevant conditions both experimental and theoretical efforts are needed. Concerning the former aspect, linear plasma devices are usually adopted, being able to generate ITER-relevant plasmas. On the numerical aspect, dedicated codes have been developed...
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3242. P2.1035 The dynamics of filaments in attached and detached SOL conditions using 3D simulationsD. Schwörer (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1035.pdfFilaments 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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D. Silvagni (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1036.pdfUnderstanding 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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S.F. Smith (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1037.pdfDuring 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...
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K. Verhaegh (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1038.pdfThe 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.
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In previous research [1] we have provided a full interpretation of particle/power balance in the TCV (L-mode) divertor using... -
M.R. Wigram (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1039.pdfThe 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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A. Wingen (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1040.pdfNon-axisymmetric heat flux patterns on a tokamak divertor can result for several reasons. Here we focus on the two most common causes. First, the plasma equilibrium itself can be nonaxisymmetric, either from applied or intrinsic 3D perturbation fields, and second, the plasma facing components (PFCs) may be toroidally...
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M. Peret (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1041.pdfUnderstanding the plasma transport at the boundary of magnetic confinement devices is needed to improve both confinement & power exhaust. Low to high confinement mode transition relates to the reduction of transport across flux surfaces near the separatrix, and transport in the scrape off layer (SOL) directly sets the...
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J. Adamek (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1042.pdfInvestigation of the ELM using divertor probes can provide heat loads and electron temperature with high temporal resolution [1, 2]. Recent evaluation of ELM electron temperature with JET divertor probes showed that the maxima of ELM electron temperature are almost one order of magnidute lower than the pedestal temperature...
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G. Akkermans (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1043.pdfIn 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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L. Bock (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1044.pdfTo interpret impurity migration measurements in fusion experiments the evolution of the first wall surface composition and the resulting dynamics of impurity fluxes into the plasma have to be taken into account. The global impurity migration code WallDYN [1] calculates the surface compositions and impurity fluxes self...
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I. Borodkina (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1045.pdfCOMPASS 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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M. Brenzke (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1046.pdfOne of the main challenges in the design of an economically viable fusion reactor are the highly localized thermal loads experienced by the plasma facing components, especially the targets in a divertor-based design, on which this work focuses. These thermal loads cause degradation of the target material and might severely...
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V.P. Budaev (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1047.pdfPowerful 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...
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B. Buttenschön (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1048.pdfThe 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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R. Chandra (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1049.pdfThe realization of fusion energy requires breakthroughs in divertor control to withstand the tremendous heat flux from a burning plasma. One solution is to operate in the detached plasma state. Reaching and controlling this state require better understanding of the underlying mechanisms. By using linear plasma generators,...
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M. Cole (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1050.pdfIn recent work, the total-f global gyrokinetic particle-in-cell code XGC has been extended to stellarator geometries. In this presentation, we show verification studies and initial results with the new stellarator version, XGC-S, for ion temperature gradient driven modes. XGC-S calculations are found to agree well with the...
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O.P. Ford (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1051.pdfIn a survey of ion temperature (Ti) profiles in ECRH dominated W7-X plasmas during the most recent W7-X campaign, it is found that no strong dependence of the central ion temperature on either electron temperature or plasma density exists. This indicates that the ion heating, which occurs through transfer of heat from...
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B. Shanahan (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1052.pdfThe 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...
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N. Chaudhary (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1053.pdfThe 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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M. Hirsch (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1054.pdfThe electron cyclotron emission (ECE) diagnostic system of W7-X is comprised of a 32 channel radiometer for detecting the 2nd harmonic emission1 in the frequency range from 126 to 162 GHz and a Michelson interferometer providing broadband spectra 2 that share the same line of sight. The EC emission was measured throughout...
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P.Z. Poloskei (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1055.pdfBalmer-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...
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H. Trimino Mora (EPS 2019)09/07/2019, 14:00MCF
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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T. Windisch (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1057.pdfIn 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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D. Zhang (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1058.pdfThe optimized stellarator Wendelstein 7-X (W7-X) has recently conducted its first divertor operation. One of the main scientific objectives is to examine and optimize the island divertor as a potential concept for a future stellarator reactor. One promising approach is to keep the impurities released from the...
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Y. Gao (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1059.pdfWendelstein 7-X (W7-X) is one of the world's most advanced stellarators. Electron cyclotron resonance heating (ECRH) [1] was the main heating system during the operation phase 1.2 (OP 1.2) in W7-X. Apart from heating, the remotely steerable launchers of the ECRH-system allow to drive current at different plasma radii...
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A. Knieps (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1060.pdfThe Wendelstein-7X (W7-X) experiment aims to demonstrate steady-state long-pulse discharges at high power and high performance. For heat- and particle-exhaust, W7-X makes use of an island divertor, which relies on a magnetic island chain between the divertor plates and the last closed flux surface. The strike-line shape on...
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R. Koenig (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1061.pdfcentral aim of the superconducting stellarator Wendelstein 7-X (W7-X) is to demonstrate the suitability of the island divertor concept to meet the requirements of power and particle exhaust during continuous operation. Without boronisation, stable completely detached plasma operation (peak heat loads reduced by factors of...
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V. Perseo (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1062.pdfThe Scrape-Off Layer (SOL) of the Wendelstein 7-X (W7-X) stellarator is characterized by the presence of magnetic islands, which have been exploited for the island divertor configuration. The complex 3D magnetic topology of W7-X leads to a structure of SOL counterstreaming flows that is also 3D. This pattern, previously...
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T. Andreeva (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1063.pdfWendelstein 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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S.A. Lazerson (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1064.pdfThe 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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U. Neuner (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1065.pdfThe intrinsic, diffusion driven toroidal (bootstrap) current has been measured in the stellarator Wendelstein 7-X for several magnetic configurations at line integrated plasma densities between 2 and 16 × 1019 m-2 and heating powers between 0.5 and 6 MW. A Rogowski coil was employed to measure the net toroidal current in...
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K. Rahbarnia (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1066.pdfDuring 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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J. Schmitt (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1067.pdfThe 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...
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G.A. Wurden (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1068.pdfLow 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,...
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G. Kocsis (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1069.pdfA Tracer-Encapsulated Solid Pellet (TESPEL) injection system was recently developed and installed on the Wendelstein 7-X (W7-X) stellarator. A tracer impurity (typically high-Z materials like iron or tungsten) for impurity transport investigations is embedded into a polystyrene polymer (C8H8)n sphere with a diameter of <1...
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M. Machielsen (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1070.pdfFast 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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M. Ye (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1072.pdfIn the future fusion reactor, power exhaust is one of the most critical issues due to the limit of the heat load onto divertor targets. Because the carbon are not suitable to be used as the first wall material, tungsten divertor is considered as the most appropriate candidate, which implies that impurity seeding is...
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M.J. Choi (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1073.pdfNon-diffusive avalanche-like transport events are observed in the L-mode and the weak ITB core plasmas in KSTAR when magnetohydrodynamic instabilities are absent. This observation implies that the avalanche-like event are a prevalent and universal process in the electron heat transport of tokamak plasmas. In addition, the...
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M. Falessi (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1074.pdfA framework to validate reduced particle and energy transport models based on the theoretical framework introduced in [1, 2] is proposed. The motivation of the present work is two-fold: (i) extending first-principle-based gyrokinetic simulations to long time scales is extremely demanding from a computational resource point...
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S. Haskey (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1075.pdfMeasurements of main-ion (D+) properties from the pedestal top to separatrix are challenging the commonly held assumption that the impurity toroidal rotation and temperature always provides a good proxy for the main-ion properties near the plasma edge. This has far-reaching consequences for SOL boundary conditions,...
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M. Marin (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1076.pdfDue to the low gas puff fuelling efficiency in future reactors, pellets will be used to provide the necessary particle fuelling. Since the core isotope composition should be maintained and controlled at 50 : 50% D-T, it is important to understand and accurately model multiple-isotope particle transport, including during...
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3284. P2.1077 Core transport studies in tokamaks plasmas via surrogate-based optimization techniquesP. Rodriguez-Fernandez (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1077.pdfUnderstanding 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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G. Spizzo (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1078.pdfCollisional particle transport in the presence of field perturbations originating from various MHD activity is examined theoretically on tokamaks (ITER, ASDEX Upgrade, NSTX and DIIID) and the reversed-field pinch RFX-mod [1]. For ITER and ASDEX Upgrade, modes typically leading to a disruption [2] are considered. On NSTX...
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G.M. Staebler (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1079.pdfGyro-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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B.P. van Milligen (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1080.pdfOur 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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P. Vincenzi (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1081.pdfDuring 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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E. Neto (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1082.pdfObservations in JET hybrid scenarios show that early termination of the plasma can be caused by tungsten accumulation events, sometimes preceded by large living MHD perturbations [1]. Only recent investigations have been made into understanding the effects of 3D background rotation profiles and 3D MHD equilibria on the...
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C. Angioni (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1083.pdfMagnetic 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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L. Carraro (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1084.pdfClear 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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B. Ding (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1085.pdfStudies in EAST show that lower recycling and higher source frequency are preferred to improve LHCD (lower hybrid current drive) capability at high density due to the mitigation of parasitic effects of edge plasma, mainly ascribed to parametric instability (PI) and collisional absorption (CA) in edge region [1, 2]. A...
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T. Kurki-Suonio (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1086.pdfThe 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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A. Ram (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1087.pdfThe scrape-off layer and the edge region in fusion plasmas are replete with turbulence induced incoherent fluctuations, and coherent fluctuations, such as blobs and filaments. Radio frequency (RF) electromagnetic waves, excited by antenna structures placed near the wall of a fusion device, encounter this turbulent region...
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J. Frank (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1088.pdfTransport in a Tokamak is caused by several mechanisms. While at the plasma edge turbulent transport dominates, neoclassical transport is important in the core region especially for heavy impurities [1]. Furthermore, large-scale MHD instabilities like magnetic islands are known to influence the transport of heat,...
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R. Barni (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1089.pdfExperimental 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 report the results of an...
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N. Bonanomi (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1090.pdfSince 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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G.D. Conway (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1091.pdfThe 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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T. Wegner (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1092.pdfThis 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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M. Pueschel (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1093.pdfMicrotearing (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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S. Nishimura (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1094.pdfControl 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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G. Batanov (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1095.pdfNon-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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G. Decristoforo (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1096.pdfIntermittent 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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O. Grover (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1097.pdfThe analysis of turbulent flows in the edge region of tokamak plasmas requires the measurement of time-averaged turbulent stresses and fluxes such as the Reynolds stress (RS), which has been identified in recent models and experiments [1] as a likely driver of poloidal zonal flows expected to play a key role in the L-H...
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A. Iantchenko (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1098.pdfProper 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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K. Jirakova (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1099.pdfTurbulent 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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M. Pedroni (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1100.pdfDivertor 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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F. Bairaktaris (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1101.pdfHomogenization 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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E. L Claveau (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1102.pdfThe 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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M.G. Levashova (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1103.pdfThe 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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K. Ibano (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1104.pdfErosion of wall materials during transient events is a large concern for ITER and future fusion devices with high external heat power. The extensive heat loads cause melting, vaporization, and ablation of wall materials. It is known that the vapor shielding can be an inherent protection mechanism for the wall erosion...
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M. Obiki (EPS 2019)09/07/2019, 14:00MCF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1105.pdfDevelopment of SOL/divertor simulation codes is important to understand physics of edge plasma which determines huge heat fluxes to plasma-facing components, i.e., the bottleneck of fusion device designs. Fluid modeling is mainly used for SOL/divertor plasma simulations. However, there are a number of discrepancies...
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K.V. Safronov (EPS 2019)09/07/2019, 14:00BPIF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2001.pdfTemporal 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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E.A. Peter (EPS 2019)09/07/2019, 14:00BPIF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2002.pdfA 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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V.T. Tikhonchuk (EPS 2019)09/07/2019, 14:00BPIF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2003.pdfProcesses 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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3317. P2.2005 Novel criteria for efficient Raman or Brillouin amplification of laser beams in plasmaR. Trines (EPS 2019)09/07/2019, 14:00BPIF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2005.pdfTwenty 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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B. Greenwood (EPS 2019)09/07/2019, 14:00BPIF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2006.pdfLaser-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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S. Ferguson (EPS 2019)09/07/2019, 14:00BPIF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2007.pdfAll-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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S. Borodziuk (EPS 2019)09/07/2019, 14:00BPIF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2008.pdfInvestigations 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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P. Kumar (EPS 2019)09/07/2019, 14:00BPIF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2009.pdfDevelopments in CO_2 laser technology at BNL Accelerator Test Facility (ATF) has opened the possibility of exploring CO_2 laser driven wakes, a regime capable of producing large accelerating structures, enabling better probing of wakes and precise external injection. 3D numerical simulations motivated by laser...
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A. Helm (EPS 2019)09/07/2019, 14:00BPIF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2010.pdfPlasma based acceleration (PBA) is seen as a promising candidate for future accelerators. While magnetic fields are commonly used in conventional accelerators, our previous work [1] has shown that magnetic fields can be used for controlling injection in PBA scenarios. On this paper we extend this work by using the...
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F.B. Russman (EPS 2019)09/07/2019, 14:00BPIF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2011.pdfSpatially 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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S. Kumar (EPS 2019)09/07/2019, 14:00BPIF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2012.pdfThe particle accelerators are the most promising and useful devices for mankind. Plasma based accelerators are fascinating as there is no problem of electrical breakdown and these can generate large accelerating fields [1 2]. Laser wakefield acceleration is one of the techniques that employs plasma and high...
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M. Yadav (EPS 2019)09/07/2019, 14:00BPIF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2013.pdfLaser-wakefield acceleration offers a compact electron acceleration scheme for generating a multi-GeV electron beam, utilizing the high longitudinal electric field gradient induced by high intensity, ultrashort laser pulse. The bubble regime of the laser wakefield acceleration is one of the most recent and promising...
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I.D. Almansa (EPS 2019)09/07/2019, 14:00BPIF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2014.pdfIn 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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F.B. Rizzato (EPS 2019)09/07/2019, 14:00BPIF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2015.pdfIn 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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L. Gremillet (EPS 2019)09/07/2019, 14:00BPIF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2016.pdfForthcoming 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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J. Vieira (EPS 2019)09/07/2019, 14:00BPIF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2017.pdfThe 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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M. Pardal (EPS 2019)09/07/2019, 14:00BPIF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2018.pdfRadiation 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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M. Singh (EPS 2019)09/07/2019, 14:00BPIF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2019.pdfWe investigate the propagation of laser pulse in plasmas to estimate the pulse compression based on collisional absorption under weak-relativistic ponderomotive nonlinearity. The physical mechanism behind it is analyzed theoretically. Absorption of laser energy in plasma has been a curial issue, which has been,...
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E.P. Volchok (EPS 2019)09/07/2019, 14:00BPIF
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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... -
M. Niroozad (EPS 2019)09/07/2019, 14:00BPIF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2021.pdfA 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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T. Johzaki (EPS 2019)09/07/2019, 14:00BPIF
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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... -
O. Klimo (EPS 2019)09/07/2019, 14:00BPIF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2023.pdf
One of the most promising techniques to enhance focused laser intensities is to tightly focus the beam using an ellipsoidal plasma mirror. It has been successfully employed to obtain subµm spot size [1] resulting in an order of magnitude increase in focused intensity in comparison with a typical spot size of about 4 µm... -
H. Sakagami (EPS 2019)09/07/2019, 14:00BPIF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2024.pdfA 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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Y. Sentoku (EPS 2019)09/07/2019, 14:00BPIF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2025.pdfHigh 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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T. Nakamura (EPS 2019)09/07/2019, 14:00BPIF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2026.pdfLaser 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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M. Grech (EPS 2019)09/07/2019, 14:00BPIF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2027.pdfSMILEI [1] is an open-source, collaborative Particle-In-Cell (PIC) code co-developed by plasma physicists and high-performance computing (HPC) specialists. This poster presents the current status of the project with a special focus on (i) the physics modules available and (ii) the HPC developments and its performance...
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G. Cristoforetti (EPS 2019)09/07/2019, 14:00BPIF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2028.pdfIn 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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L.M. Chen (EPS 2019)09/07/2019, 14:00BPIF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2029.pdfCollimated 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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J. Xiong (EPS 2019)09/07/2019, 14:00BPIF
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2030.pdfExperiments and numerical simulation show that -ray radiation can be effectively enhanced with gold foam through a new mechanism. As shown in Fig.1and Fig.2, the intensity laser can enter into the high density reign which is close to the foam's bubble cavity region due to the "hole boring "effect. The reflux cold...
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A. Kartasheva (EPS 2019)09/07/2019, 14:00LTPD
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3001.pdfThe 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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A. Chami (EPS 2019)09/07/2019, 14:00LTPD
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3002.pdfThe study of nanoparticle (NP) dynamics is done in a DC unbalanced magnetron discharge using argon plasma at 30 Pa. The plasma is produced between two electrodes: a 7.62 cm diameter tungsten cathode negatively biased and a stainless steel grounded anode 10 cm apart. The discharge current was fixed at 0.3 A and...
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A. Mustafaev (EPS 2019)09/07/2019, 14:00LTPD
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3003.pdfCurrently, 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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J. Schäfer (EPS 2019)09/07/2019, 14:00LTPD
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3004.pdfWe 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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A.A. Aliverdiev (EPS 2019)09/07/2019, 14:00LTPD
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3005.pdfHere 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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J.V. Triaskin (EPS 2019)09/07/2019, 14:00LTPD
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3006.pdfThe 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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S. Valin (EPS 2019)09/07/2019, 14:00LTPD
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3007.pdfNon-thermal atmospheric pressure plasma jets have been subject to numerous scientific studies during the last decades [1]. An extremely wide application field of such devices demands deep understanding of the plasma processes. One of those, which influences the formation of various spatiotemporal structures in the gas...
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V.S. Nikolaev (EPS 2019)09/07/2019, 14:00LTPD
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3008.pdfDusty 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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U. Sharma (EPS 2019)09/07/2019, 14:00LTPD
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3009.pdfA theoretical model is created consolidating the charging rate of the carbon nanotube (CNT), the energy of all the species present in plasma, and the growth rate of the multi-walled carbon nanotube (MWCNT) owing to the surface and bulk diffusions and accumulation of particles on the catalyst nanoparticle surface. Using...
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3352. P2.3010 Investigation of radiation spectrum from pulse discharge in atmospheric pressure argonS.A. Mayorov (EPS 2019)09/07/2019, 14:00LTPD
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3010.pdfAn 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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A. Momot (EPS 2019)09/07/2019, 14:00LTPD
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3011.pdfDust grains acquire electric charges (eg) due to absorption of electrons (e) and ions (i) from the surrounding plasma, i.e. each grain is charged by the plasma currents Ich ( = e, i) to its surface. The electric field fluctuations influence the charging currents and, thus, give rise to the grain charge fluctuations....
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C.M. Ticos (EPS 2019)09/07/2019, 14:00LTPD
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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... -
M. Isupov (EPS 2019)09/07/2019, 14:00LTPD
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3013.pdf
Ferromagnetic enhanced inductively coupled plasma sources (FMICP) are considered to be a
promising solution to produce large volumes of dense (~1012 cm-3) uniform plasma for largearea
(450 mm) plasma processing systems, due to a high power transfer efficiency, reduced
driving frequency (<0.4 MHz), the absence of capacitive... -
W. Lee (EPS 2019)09/07/2019, 14:00LTPD
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3014.pdf
Atoms and ions in plasmas are suffered by collision with another particle, local electric field by electron and ion, plasma radiation, and so on. These interactions cause spectral line broadening of plasma radiation such as natural broadening, Doppler broadening, van der Waals broadening, resonance broadening, and Stark... -
C. Rafferty (EPS 2019)09/07/2019, 14:00LTPD
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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... -
A. Dahiya (EPS 2019)09/07/2019, 14:00LTPD
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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... -
T.I. Morozova (EPS 2019)09/07/2019, 14:00LTPD
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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.... -
D. Zielke (EPS 2019)09/07/2019, 14:00LTPD
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3018.pdf
In ion sources for neutral beam heating systems used in fusion, low temperature hydrogen plasmas are sustained by inductive RF coupling in compact cylindrical discharges of several dm3. The sources are typically operated at low pressures up to 0.3 Pa and powers of 100 kW yielding power densities of 10 MW/m3 to reach plasma... -
A. Tamman (EPS 2019)09/07/2019, 14:00LTPD
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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... -
Z. Luo (EPS 2019)09/07/2019, 14:00LTPD
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3020.pdf
Monolayer 2D materials, including graphene and transition metal dichalcogenides (TMDs) are promising materials for applications in optoelectronics. In our laboratory, we have developed a series of strategies to synthesis high-quality graphene and TMDs layers, as well as their heterostructure, with tuneable properties using... -
G. Dobrev (EPS 2019)09/07/2019, 14:00
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3021.pdfWe present experimental investigations of the transport properties of NiH radical in molecular hydrogen gas. We use NiH to model the behaviour of the first row transition metal monohydrides (e.g. CrH, FeH,TiH) that are established markers for cool stellar atmospheres - i.e. M, L, T-type stars. The data presented here...
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D. Sciacqua (EPS 2019)09/07/2019, 14:00
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3022.pdfPlasma enhanced chemical vapour deposition (PECVD) is a technique that originates from the conventional chemical vapour deposition (CVD). PECVD is a technique that allows in particular the deposition of ultra-thin and pinhole free polymer films on a great class of substrates. The main role of cold plasmas in this...
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V. Pavlenko (EPS 2019)09/07/2019, 14:00BSAP
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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... -
R. Gueroult (EPS 2019)09/07/2019, 14:00BSAP
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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... -
M. Romé (EPS 2019)09/07/2019, 14:00BSAP
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4003.pdf
The dynamics of a two-dimensional (2D) inviscid and incompressible fluid can be conveniently studied using a strongly-magnetized pure electron plasma confined in a PenningMalmberg trap, thanks to a mathematical analogy where the fluid velocity is equivalent to the plasma E × B velocity, and fluid vorticity and stream... -
G. Maero (EPS 2019)09/07/2019, 14:00BSAP
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4004.pdf
Penning-Malmberg traps are known and extensively used as unique tools for long-term charged particles storage, precise manipulation and measurement of trapped samples, creation of highquality bunched beams [1]. This array of opportunities results from decades of theoretical and experimental studies of the dynamical and... -
S. Hosseini Jenab (EPS 2019)09/07/2019, 14:00BSAP
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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... -
R. Dhawan (EPS 2019)09/07/2019, 14:00BSAP
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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... -
P.K. Barnwal (EPS 2019)09/07/2019, 14:00BSAP
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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... -
P.J. Rathod (EPS 2019)09/07/2019, 14:00BSAP
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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... -
P. Alex (EPS 2019)09/07/2019, 14:00BSAP
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4009.pdf
A double plasma device comprising of two isolated SS304 chambers namely, source and target plasma chambers is used to develop understanding on mechanism involved in realizing a control on electron temperature in the target region. Electron temperature is controlled locally as well as radially by charging a single grid and... -
L. Valvo (EPS 2019)09/07/2019, 14:00BSAP
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4010.pdf
Guiding Centre theory refers to the problem of finding an exact description for the motion of a charged particle in a given magnetic field. Recently, a new, exact, approach to guiding centre theory has been proposed [1], [2]. In this new approach the guiding centre is defined geometrically as the reference frame in which a... -
Huasheng Xie (EPS 2019)09/07/2019, 14:00
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4011.pdfA 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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L. Simonchik (EPS 2019)09/07/2019, 14:00BSAP
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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... -
A.A. Kulichenko (EPS 2019)09/07/2019, 14:00BSAP
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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],... -
D. Mandal (EPS 2019)09/07/2019, 14:00BSAP
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http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4014.pdf
In Hall thruster geometry, the electric and magnetic field configuration creates a huge difference in drift velocity between electrons and ions, which generates electron cyclotron drift instability or E × B electron drift instability[1]. Unstable modes generated from this instability have an important role in cross-field... -
A. Mustafaev (EPS 2019)09/07/2019, 14:00BSAP
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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... -
R. Bingham (EPS 2019)09/07/2019, 14:00BSAP
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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...
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