Nonlinear MHD modeling of n = 1 RMP-induced pedestal transport and mode coupling effects on ELM suppression in KSTAR
Abstract
We report fully suppressing edge-localized modes (ELMs), e.g., with resonant magnetic perturbations (RMPs), is essential to reach and sustain high-performance steady-state H-mode plasmas because large ELMs can significantly reduce the lifetime of divertor components in future tokamak reactors. RMP-driven ELM suppression in KSTAR has been modeled by coupling the neoclassical transport code PENTRC to the nonlinear 3D MHD code JOREK. We have found that the radial transport from the combined effects of the kink-peeling, tearing response, and neoclassical toroidal viscosity can explain the pedestal degradation observed in experiments. In addition, it has been found that the RMP response can increase the inter-ELM heat flux on the lower outer divertor by redistributing the heat transport between the divertor plates. In addition to the degraded pedestal, ELM suppression is also attributable to the RMP-induced mode interactions. While the linear stability of peeling-ballooning mode (PBMs) improves owing to the degraded pedestal, the PBM and RMP interaction increases the spectral transfer between edge harmonics, preventing catastrophic growth and the crash of unstable modes. Here, it turns out that the magnetic islands near the pedestal top can play a vital role in mediating the mode interactions.
- Authors:
-
[1];
[3];
[4];
[5];
[5];
[5];
[8];
[9];
[10];
[1]
- Princeton University, NJ (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Seoul National University (Korea, Republic of)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- CEA, IRFM, Saint Paul Lez Durance (France)
- CEA, IRFM, Saint Paul Lez Durance (France); Eindhoven University of Technology (Netherlands)
- Max Planck Institute for Plasma Physics, Munich (Germany)
- Ulsan National Institute of Science and Technology (UNIST), Ulsan (Korea, Republic of)
- Korea Institute of Science Technology (Korea, Republic of)
- Korea Institute of Fusion Energy, Daejeon (Korea, Republic of)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); Korea Institute of Fusion Energy(KFE); Ministry of Science and ICT of the Republic of Korea; EUROfusion Consortium
- Contributing Org.:
- JOREK Team
- OSTI Identifier:
- 1889718
- Alternate Identifier(s):
- OSTI ID: 1890818
- Report Number(s):
- LLNL-JRNL-836755
Journal ID: ISSN 0029-5515; EN2021-12; KFE-EN2241-8; 633053; TRN: US2309973
- Grant/Contract Number:
- SC0020372; AC52-07NA27344; AC02-09CH11466; KFE-EN2241-8
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 62; Journal Issue: 10; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; edge localized mode; RMP; KSTAR; peeling ballooning mode; nonlinear MHD; mode coupling; neoclassical toroidal viscosity
Citation Formats
Kim, S. K., Pamela, S., Logan, N. C., Na, Y. -S., Lee, C. Y., Park, J. -K., Yang, S. M., Hu, Q., Becoulet, M., Huijsmans, G., Hoelzl, M., In, Y., Kim, M. W., Lee, H. H., Lee, J., Lee, J. H., Kwon, O., and Kolemen, E. Nonlinear MHD modeling of n = 1 RMP-induced pedestal transport and mode coupling effects on ELM suppression in KSTAR. United States: N. p., 2022.
Web. doi:10.1088/1741-4326/ac84ef.
Kim, S. K., Pamela, S., Logan, N. C., Na, Y. -S., Lee, C. Y., Park, J. -K., Yang, S. M., Hu, Q., Becoulet, M., Huijsmans, G., Hoelzl, M., In, Y., Kim, M. W., Lee, H. H., Lee, J., Lee, J. H., Kwon, O., & Kolemen, E. Nonlinear MHD modeling of n = 1 RMP-induced pedestal transport and mode coupling effects on ELM suppression in KSTAR. United States. https://doi.org/10.1088/1741-4326/ac84ef
Kim, S. K., Pamela, S., Logan, N. C., Na, Y. -S., Lee, C. Y., Park, J. -K., Yang, S. M., Hu, Q., Becoulet, M., Huijsmans, G., Hoelzl, M., In, Y., Kim, M. W., Lee, H. H., Lee, J., Lee, J. H., Kwon, O., and Kolemen, E. Wed .
"Nonlinear MHD modeling of n = 1 RMP-induced pedestal transport and mode coupling effects on ELM suppression in KSTAR". United States. https://doi.org/10.1088/1741-4326/ac84ef. https://www.osti.gov/servlets/purl/1889718.
@article{osti_1889718,
title = {Nonlinear MHD modeling of n = 1 RMP-induced pedestal transport and mode coupling effects on ELM suppression in KSTAR},
author = {Kim, S. K. and Pamela, S. and Logan, N. C. and Na, Y. -S. and Lee, C. Y. and Park, J. -K. and Yang, S. M. and Hu, Q. and Becoulet, M. and Huijsmans, G. and Hoelzl, M. and In, Y. and Kim, M. W. and Lee, H. H. and Lee, J. and Lee, J. H. and Kwon, O. and Kolemen, E.},
abstractNote = {We report fully suppressing edge-localized modes (ELMs), e.g., with resonant magnetic perturbations (RMPs), is essential to reach and sustain high-performance steady-state H-mode plasmas because large ELMs can significantly reduce the lifetime of divertor components in future tokamak reactors. RMP-driven ELM suppression in KSTAR has been modeled by coupling the neoclassical transport code PENTRC to the nonlinear 3D MHD code JOREK. We have found that the radial transport from the combined effects of the kink-peeling, tearing response, and neoclassical toroidal viscosity can explain the pedestal degradation observed in experiments. In addition, it has been found that the RMP response can increase the inter-ELM heat flux on the lower outer divertor by redistributing the heat transport between the divertor plates. In addition to the degraded pedestal, ELM suppression is also attributable to the RMP-induced mode interactions. While the linear stability of peeling-ballooning mode (PBMs) improves owing to the degraded pedestal, the PBM and RMP interaction increases the spectral transfer between edge harmonics, preventing catastrophic growth and the crash of unstable modes. Here, it turns out that the magnetic islands near the pedestal top can play a vital role in mediating the mode interactions.},
doi = {10.1088/1741-4326/ac84ef},
journal = {Nuclear Fusion},
number = 10,
volume = 62,
place = {United States},
year = {Wed Sep 07 00:00:00 EDT 2022},
month = {Wed Sep 07 00:00:00 EDT 2022}
}
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