https://doi.org/10.1140/epjs/s11734-024-01462-2
Regular Article
Influence of pedestal pressure on plasma response to resonant magnetic perturbation field
1
Chongqing Key Laboratory of Intelligent Perception and BlockChain Technology, Chongqing Technology and Business University, 400067, Chongqing, China
2
General Atomics, PO Box 85608, 92186-5608, San Diego, CA, USA
3
Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, GPETR Center for Quantum Precision Measurement, SPTE, South China Normal University, 510006, Guangzhou, China
4
UKAEA, Culham Science Centre, OX14 3DB, Abingdon, UK
5
College of Science, Dalian Maritime University, 116026, Dalian, China
6
Southwestern Institute of Physics, 610041, Chengdu, China
a
yangxu@ctbu.edu.cn
b
liuy@fusion.gat.com
Received:
24
October
2024
Accepted:
19
December
2024
Published online:
9
January
2025
A systematic numerical investigation is carried out to understand the effect of variation of the equilibrium pressure pedestal structure on the H-mode plasma response to the applied resonant magnetic perturbation (RMP) field in tokamaks. The plasma response to the n = 1–4 (n is the toroidal mode number) RMP fields is computed and analyzed utilizing the toroidal MHD code MARS-F (Liu et al. in Phys. Plasmas 7:3681, 2000). The edge safety factor is fixed while varying the pressure pedestal height or width in the single-null (SN) and double-null (DN) divertor-like configurations. The key results are: (i) the optimal coil current phasing for ELM control, between two rows of RMP coils, is insensitive to the assumed pedestal height or width, (ii) with the same coil current and optimal coil phasing and assuming the Spitzer model for the plasma resistivity, a higher pedestal height generally leads to less edge-peeling response of the plasma and thus more challenge to control the edge localized mode (ELM), and (iii) a wider pressure pedestal generally increases the edge-peeling response and hence favors ELM control. These results hold particularly well for n > 1 RMPs, for both the SN and DN plasmas.
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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.