ICRF near-field effects sensitivity to magnetic tilt-angle

Guillaume Urbanczyk; Syun’ichi Shiraiwa; Nicola Bertelli; Wouter Tierens; Roberto Bilato; Volodymyr Bobkov; Roman Ochoukov; Ralph Dux; Laurent Colas; James-Paul Gunn; Julien Hillairet; Nicolas Fedorczak; Raymond Diab; Léonel Tsowémoo Faabomvé; Jérôme Moritz; Stéphane Heuraux

doi:10.1051/epjconf/202634602009

All issues

Volume 346 (2026)

EPJ Web Conf., 346 (2026) 02009

Abstract

Open Access

Issue		EPJ Web Conf. Volume 346, 2026 25^th Topical Conference on Radio-Frequency Power in Plasmas (RFPPC2025)


Article Number		02009
Number of page(s)		7
Section		Wave Heating and Current Drive in Present and Future Fusion Devices
DOI		https://doi.org/10.1051/epjconf/202634602009
Published online		07 January 2026

EPJ Web of Conferences 346, 02009 (2026)
https://doi.org/10.1051/epjconf/202634602009

ICRF near-field effects sensitivity to magnetic tilt-angle

Guillaume Urbanczyk^a^,b^*, Syun’ichi Shiraiwa^c, Nicola Bertelli^c, Wouter Tierens^d, Roberto Bilato^b, Volodymyr Bobkov^b, Roman Ochoukov^b, Ralph Dux^b, Laurent Colas^e, James-Paul Gunn^e, Julien Hillairet^e, Nicolas Fedorczak^e, Raymond Diab^f, Léonel Tsowémoo Faabomvé^a, Jérôme Moritz^a, Stéphane Heuraux^b, ASDEX Upgrade Team⁺ and WEST Team, and EUROfusion Tokamak Exploitation Team⁺⁺

^a Institut Jean Lamour UMR 7198 CNRS - Université de Lorraine 2 allée André Guinier F-54011 Nancy, France
^b Max-Planck-Institut für Plasmaphysik, Boltzmannstrasse 2, D-85748 Garching, Germany
^c Princeton Plasma Physics Laboratory, Princeton, NJ 08540, United States of America
^d Oak Ridge National Laboratory, Oak Ridge, TN, United States of America
^e CEA, IRFM, F-13108 Saint Paul-Lez-Durance, France
^f Plasma Science and Fusion, Massachusetts Institute of Technology, Cambridge, MA, USA
⁺ See author list of H. Zohm et al 2024 Nucl. Fusion 64 112001
⁺⁺ See the author list of E. Joffrin et al 2024 Nucl. Fusion 64 112019

^* Corresponding author: guillaume.urbanczyk@cnrs.fr

Published online: 7 January 2026

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.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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