RF wave coupling, plasma heating and characterization of induced plasma-material interactions in WEST L-mode discharges
| Autor: | Gilles Lombard, J. P. Gunn, C. Christopher Klepper, Ernesto Lerche, Laurent Colas, Julien Hillairet, Ke Wang, D. Vezinet, Jiuyuan Li, P. Devynck, M. Usoltceva, Brigitte Pegourie, C. Desgranges, A. Ekedahl, Guillaume Urbanczyk, J. Morales, Stéphane Heuraux, Walid Helou, Nicolas Fedorczak, V. Bobkov, T. Loarer, Patrick Mollard, V Ostuni, Ezekial A Unterberg, C. Yan |
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| Přispěvatelé: | Shenzhen University, Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de physique des plasmas de l'ERM, Laboratorium voor plasmafysica van de KMS (LPP ERM KMS), Ecole Royale Militaire / Koninklijke Militaire School (ERM KMS), Institut Jean Lamour (IJL), Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Max-Planck-Institut für Plasmaphysik [Garching] (IPP), ITER organization (ITER), Oak Ridge National Laboratory [Oak Ridge] (ORNL), UT-Battelle, LLC, Institute of Plasma Physics, Chinese Academy of Sciences (ASIPP), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), WEST Team, heuraux, stéphane |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Nuclear and High Energy Physics
Tokamak Materials science Divertor Cyclotron Plasma Condensed Matter Physics 01 natural sciences 7. Clean energy Electromagnetic radiation 010305 fluids & plasmas law.invention Ion law [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph] [PHYS.PHYS.PHYS-PLASM-PH] Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph] 0103 physical sciences RF sheath Limiter ion cylotron heating Atomic physics 010306 general physics Absorption (electromagnetic radiation) |
| Zdroj: | Nuclear Fusion Nuclear Fusion, IOP Publishing, 2021, 61 (8), pp.086027 HAL Nuclear Fusion, 2021, 61 (8), pp.086027. ⟨10.1088/1741-4326/ac0d11⟩ |
| ISSN: | 0029-5515 1741-4326 |
| Popis: | International audience; Plasma heating in the full Tungsten (W) Environment in Steady-state Tokamak (WEST) relies on electromagnetic waves in both Lower Hybrid (LH) and Ion Cyclotron Range of Frequencies (ICRF). The present study focuses mostly on the optimization of discharges heated with ICRF, by reporting different methods to first optimize wave coupling, optimize their absorption and reduce the impurity production. It is shown that ICRF coupling can be optimized either by moving the plasma closer to antennas, increasing the plasma density, wave frequency and LH power. We show that the absorption efficiency correlates with the hydrogen concentration with the existence of an optimum between 7 and 10% as expected for a minority heating scenario. Absolutely calibrated visible spectroscopy sightlines were used to monitor ion fluxes in different locations as part of an effort to quantitively estimate the contribution of different impurity sources to the core contamination by tungsten. It is typically found that in discharges with high total RF-power (above 5MW of LH and 3MW of ICRF), divertor and antenna limiter sources can reach similar order of magnitude during the ICRF phase. |
| Databáze: | OpenAIRE |
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