Localizing resonant magnetic perturbations for edge localized mode control in KSTAR

Yang, S. M.; Park, J.-K.; Logan, N. C.; Zhu, C.; Hu, Q.; Jeon, Y. M.; In, Y.; Ko, W. H.; Kim, S. K.; Lee, Y.H.; Na, Y. S.

doi:10.1088/1741-4326/aba1cf

Localizing resonant magnetic perturbations for edge localized mode control in KSTAR

Journal Article · Fri Aug 14 00:00:00 EDT 2020 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aba1cf· OSTI ID:1642438

^[1]; Park, J.-K. ^[1]; ^[1]; ^[1]; ^[1]; Jeon, Y. M. ^[2]; ^[3]; Ko, W. H. ^[2]; Kim, S. K. ^[4]; Lee, Y.H. ^[4]; Na, Y. S. ^[4]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
National Fusion Research Inst., Daejeon (South Korea)
Ulsan National Inst. of Science and Technology (South Korea)
Seoul National Univ. (South Korea)

An external 3D magnetic perturbation typically drives a resonant response at the rational surfaces from the core to the edge of tokamak plasmas, due to strong mode coupling and amplification. In this paper, we present a method to isolate the edge from core resonant fields using the ideal perturbed equilibrium code and to design an edge-localized resonant magnetic perturbation (RMP) for effective edge localized mode (ELM) control. A robust feature of the edge-localized RMP is the curtailed response to the field at the low-field-side (LFS) midplane, as opposed to typical RMPs which strongly resonate with the LFS fields. This emphasizes the importance of off-midplane coils to improve ELM control without provoking a large core response that could lead to devastating instabilities. The conceptual design of new ELM control coils based on the edge-localized RMP in KSTAR shows how this new insight can be utilized to enhance the efficiency of our ELM suppression capabilities. Simple window-pane coils matching the edge-localized resonant mode structure substantially expand in the ELM suppression window beyond the existing coil. Further optimization using the flexible optimized coils using space-curves code leads to additional enhancement in the edge-localized control.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 1642438

Alternate ID(s):: OSTI ID: 1642919
OSTI ID: 23018816

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 9 Vol. 60; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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