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Extending the operational boundaries of RMP-ELM suppression with optimized 3D field control

Journal Article · · Nuclear Fusion
 [1];  [2];  [1];  [3];  [4];  [1];  [3];  [3];  [3];  [3];  [3];  [1]
  1. Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
  2. Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Seoul National Univ. (Korea, Republic of)
  3. Korea Institute for Fusion Energy, Daejeon (Korea, Republic of)
  4. Columbia Univ., New York, NY (United States)
+ Show Author Affiliations
The use of 3D magnetic fields is one of the promising approaches to control edge localized modes (ELMs), and ITER has plans to utilize a flexible 3D coil set for ELM suppression using 3D fields. This study focuses on optimizing the 3D field spectrum to expand the operational window for n = 1 resonant magnetic perturbation (RMP) ELM suppression in KSTAR. The optimized n = 1 RMP effectively suppresses ELMs throughout the entire H-mode discharge, including the first ELM crash, while avoiding the onset of disruptive locked modes in low-density L-mode plasmas. The predicted suppression window aligns well with experimental data, highlighting the challenges and solutions of using n = 1 RMP at low densities. Moreover, the optimization successfully achieved n = 1 RMP ELM suppression for the first time in ITER-relevant q95 and shaping conditions, including cases with q95 as low as 3.6, as well as other q95 and shape configurations. This highlights the importance and utility of 3D coil optimization while emphasizing the potential of long-wavelength low-n RMP, which will be valuable for ex-vessel coils designed to avoid complications of nuclear degradation.
Research Organization:
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Sponsoring Organization:
Korea Institute of Fusion Energy (KFE); National Research Foundation of Korea (NRF); USDOE Office of Science (SC)
Grant/Contract Number:
AC02-09CH11466; SC0021968
OSTI ID:
2586606
Journal Information:
Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 9 Vol. 65; ISSN 1741-4326; ISSN 0029-5515
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

3D magnetic field control
ELM suppression
edge localized RMP (ERMP)
edge-localized mode (ELM) control
multi-row RMP coils
KSTAR
resonant magnetic perturbations (RMPs)