Effect of resonant magnetic perturbations including toroidal sidebands on magnetic footprints and fast ion losses in HL-2M

Hao, G. Z.; Dong, G. Q.; Liu, Y. Q.; Xu, Y. H.; Zhao, Y. F.; Wang, S.; He, H. D.; Xue, M.; Li, Z. J.; Li, J. X.; Li, C. Y.; Wang, L.; Xu, J. Q.; Chen, W.; Cai, L. J.; Zhong, W. L.; Xu, M.; Duan, X. R.

doi:10.1088/1741-4326/acea93

Effect of resonant magnetic perturbations including toroidal sidebands on magnetic footprints and fast ion losses in HL-2M

Journal Article · Wed Aug 09 00:00:00 EDT 2023 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/acea93· OSTI ID:2418888

^[1]; ^[2]; ^[3]; Xu, Y. H. ^[4]; ^[5]; ^[2]; He, H. D. ^[2]; Xue, M. ^[2]; Li, Z. J. ^[2]; Li, J. X. ^[2]; Li, C. Y. ^[2]; Wang, L. ^[2]; ^[2]; ^[2]; Cai, L. J. ^[2]; Zhong, W. L. ^[2]; Xu, M. ^[2]; Duan, X. R. ^[2]

Southwestern Institute of Physics, Chengdu (China); OSTI
Southwestern Institute of Physics, Chengdu (China)
General Atomics, San Diego, CA (United States)
Southwest Jiaotong University, Chengdu (China)
Dalian University of Technology, Dalian (China)

Externally applied resonant magnetic perturbations (RMPs), generated by magnetic coils located outside the plasma (referred to as RMP coils), provide an effective way to control the edge localized mode (ELM) in tokamak devices. Due to the discrete nature of the toroidal distribution of these window-frame coils, toroidal sidebands always exist together with the fundamental harmonics designed for ELM control. In this work, the MARS-F code (Liu et al 2000 Phys. Plasmas7 3681) is applied to investigate the detailed features of the RMP spectra considering both the dominant harmonic (n = 2) and the associated sideband (n = 6), and the impact of the combined fields on magnetic footprints as well as on the fast ion losses for a reference double-null scenario in the HL-2M device. It is found that the sum of the n = 2 and n = 6 RMP fields splits the footprint and widens the footprint area, as compared to the single-n (n = 2) harmonic case. The resistive plasma response breaks the up–down symmetry of the footprint pattern on the outer divertor plates, which is otherwise symmetric assuming vacuum RMP fields. Considering fast ion losses, a threshold value exists for the initially launched radial position of test particles, as well as for the RMP coil current, before the loss occurs. When the threshold criterion is satisfied, the combined n = 2 and n = 6 RMP fields enhance the fast ion loss rate by , as compared to that of the n = 2 component alone. These results illustrate the important role of the sideband of RMP fields on the magnetic footprints and fast ion losses in tokamak plasmas.

View Accepted Manuscript (DOE)

Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: National Key R&D Program of China; USDOE Office of Science (SC)

Grant/Contract Number:: FC02-04ER54698; FG02-95ER54309; SC0018992

OSTI ID:: 2418888

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 9 Vol. 63; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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toroidal sideband

Effect of resonant magnetic perturbations including toroidal sidebands on magnetic footprints and fast ion losses in HL-2M

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