https://doi.org/10.1140/epjs/s11734-025-01676-y
Regular Article
Modeling of the plasma response to target biasing-induced perturbations on EAST: effects of biasing position and schemes
1
Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Physics, Dalian University of Technology, 116024, Dalian, China
2
DUT-BSU Joint Institute, Dalian University of Technology, 116024, Dalian, China
3
Department of Engineering Physics, Tsinghua University, 100084, Beijing, China
4
Southwestern Institute of Physics, PO Box 432, 610041, Chengdu, China
5
Institute of Plasma Physics, HFIPS, Chinese Academy of Sciences, 230031, Hefei, China
Received:
1
November
2024
Accepted:
5
May
2025
Published online:
16
May
2025
Uncontrolled edge localized modes (ELMs) can cause severe damage to divertor targets, and thus ELMs control becomes a critical topic for long-term and steady-state operation in fusion devices. Recent studies have shown that applying biasing to the divertor targets can achieve an efficacy comparable to that of the resonant magnetic perturbation (RMP) fields in controlling ELMs. The divertor biasing technique circumvents the engineering challenges associated with installing coils within the vacuum vessel. In this work, predictive modellings of the vacuum and plasma response fields generated by biasing current filaments have been conducted using the MARS-F code on the EAST tokamak. The impacts of the biasing position of the biased electrode, the toroidal numbers of the biasing target and the biasing arrangement sequence on the in- and out-board divertor targets are investigated in depth. Modellings indicate that a shorter distance between the electrode and the strike point leads to a stronger perturbed field distribution. The dominant toroidal mode numbers of perturbed fields show a consistency with the toroidal numbers of the biasing target. The perturbed fields are strongest when the inner divertor targets on the high field side are connected to a positive biasing voltage, while the outer divertor targets on the low field side are grounded.
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© The Author(s), under exclusive licence to EDP Sciences, Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
