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Title: Localizing resonant magnetic perturbations for edge localized mode control in KSTAR

Abstract

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.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [3];  [2];  [4];  [4];  [4]
+ Show Author Affiliations
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. National Fusion Research Inst., Daejeon (South Korea)
  3. Ulsan National Inst. of Science and Technology (South Korea)
  4. Seoul National Univ. (South Korea)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1642438
Alternate Identifier(s):
OSTI ID: 1642919
Grant/Contract Number:  
AC02-09CH11466
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 60; Journal Issue: 9; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Edge localized RMP; ELM control; coil design; plasma response

Citation Formats

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., and Na, Y. S. Localizing resonant magnetic perturbations for edge localized mode control in KSTAR. United States: N. p., 2020. Web. doi:10.1088/1741-4326/aba1cf.
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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. Localizing resonant magnetic perturbations for edge localized mode control in KSTAR. United States. https://doi.org/10.1088/1741-4326/aba1cf
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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., and Na, Y. S. Fri . "Localizing resonant magnetic perturbations for edge localized mode control in KSTAR". United States. https://doi.org/10.1088/1741-4326/aba1cf. https://www.osti.gov/servlets/purl/1642438.
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@article{osti_1642438,
title = {Localizing resonant magnetic perturbations for edge localized mode control in KSTAR},
author = {Yang, S. M. and Park, J.-K. and Logan, N. C. and Zhu, C. and Hu, Q. and Jeon, Y. M. and In, Y. and Ko, W. H. and Kim, S. K. and Lee, Y.H. and Na, Y. S.},
abstractNote = {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.},
doi = {10.1088/1741-4326/aba1cf},
journal = {Nuclear Fusion},
number = 9,
volume = 60,
place = {United States},
year = {Fri Aug 14 00:00:00 EDT 2020},
month = {Fri Aug 14 00:00:00 EDT 2020}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1088/1741-4326/aba1cf
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