DOE OSTI · 3020566
ICRF near-field effects sensitivity to magnetic tilt-angle
Abstract
This paper complements the study reported in G. Urbanczyk et al 2025 Nucl. Fusion 65 046018 by investigating how near-field effects from Ion Cyclotron Range of Frequency (ICRF) antennas depend on the magnetic geometry, particularly focusing on the sensitivity of rectified sheath potentials and associated impurity production to variations in magnetic field tilt-angle. Simulations were conducted using Petra-M, employing a flat model of the ASDEX Upgrade (AUG) three-strap antenna, and COMSOL, utilizing a curved model of the WEST antenna. Results demonstrate indications of sensitivity of the rectified sheath potentials and impurity sputtering to the alignment of Faraday screen bars with the magnetic field lines, emphasizing the necessity for careful consideration of geometric alignment in antenna design for fusion devices. This trend is consistent with experimental data measured with various diagnostics.
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Urbanczyk, Guillaume [Universite de Lorraine, Nancy (France); Centre National de la Recherche Scientifique, Nancy (CNRS) (France). Institut Jean Lamour (IJL)], Shiraiwa, Syun’ichi [Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)] (ORCID:0000000152490441), Bertelli, Nicola [Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)] (ORCID:0000000293267585), Tierens, Wouter [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)], Bilato, Roberto [Max Planck Institute for Plasma Physics, Garching (Germany)], Bobkov, Volodymyr [Max Planck Institute for Plasma Physics, Garching (Germany)], Ochoukov, Roman [Max Planck Institute for Plasma Physics, Garching (Germany)], Dux, Ralph [Max Planck Institute for Plasma Physics, Garching (Germany)], Colas, Laurent [CEA, IRFM, Saint Paul Lez Durance (France)], Gunn, James-Paul [CEA, IRFM, Saint Paul Lez Durance (France)], Hillairet, Julien [CEA, IRFM, Saint Paul Lez Durance (France)], Fedorczak, Nicolas [CEA, IRFM, Saint Paul Lez Durance (France)], Diab, Raymond [Massachusetts Institute of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center], Faabomvé, Léonel Tsowémoo [Universite de Lorraine, Nancy (France); Centre National de la Recherche Scientifique, Nancy (CNRS) (France). Institut Jean Lamour (IJL)], Moritz, Jérôme [Universite de Lorraine, Nancy (France); Centre National de la Recherche Scientifique, Nancy (CNRS) (France). Institut Jean Lamour (IJL)], Heuraux, Stéphane [Max Planck Institute for Plasma Physics, Garching (Germany)]. 2026-01-07. ICRF near-field effects sensitivity to magnetic tilt-angle. https://doi.org/10.1051/epjconf%2F202634602009
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