Nonlinear MHD modeling of n = 1 RMP-induced pedestal transport and mode coupling effects on ELM suppression in KSTAR

S.K. Kim; S. Pamela; N. Logan; Y.S. Na; C. Lee; J.K. Park; S. Yang; Q. Hu; M. Becoulet; G. Huijsmans; M. Hoelzl; Y. In; M.W. Kim; H.H. Lee; J.H. Lee; J. H. Lee; O. Kwon; E. Kolemen

doi:10.1088/1741-4326/ac84ef

Nonlinear MHD modeling of n = 1 RMP-induced pedestal transport and mode coupling effects on ELM suppression in KSTAR

S.K. Kim (Corresponding author), S. Pamela, N. Logan, Y.S. Na, C. Lee, J.K. Park, S. Yang, Q. Hu, M. Becoulet, G. Huijsmans, M. Hoelzl, Y. In, M.W. Kim, H.H. Lee, J.H. Lee, J. H. Lee, O. Kwon, E. Kolemen

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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.

Originele taal-2	Engels
Artikelnummer	106021
Aantal pagina's	13
Tijdschrift	Nuclear Fusion
Volume	62
Nummer van het tijdschrift	10
DOI's	https://doi.org/10.1088/1741-4326/ac84ef
Status	Gepubliceerd - dec. 2022

Bibliografische nota

Publisher Copyright:
© 2022 IAEA, Vienna.

Financiering

The authors would like to express their deepest gratitude to KSTAR Team for the extensive supports on the RMP-ELM suppression experiment. This material was supported by the U.S. Department of Energy, under Awards DE-SC0020372 & DE-AC52-07NA27344. This work was also supported by the U.S. Department of Energy under contract number DE-AC02-09CH11466 (Princeton Plasma Physics Laboratory). The United States Government retains a non-exclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript or allow others to do so for United States Government purposes. This research was also supported by R&D Program of ‘KSTAR Experimental Collaboration and Fusion Plasma Research (EN2201-13)’ through the Korea Institute of Fusion Energy (KFE) funded by the Government funds. Computing resources were provided on the KFE computer, KAIROS, funded by the Ministry of Science and ICT of the Republic of Korea (KFE-EN2241-8). Part of this work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training program 2014-2018 and 2019-2020 under Grant Agreement No. 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. This work was partly carried out the Marconi-Fusion supercomputer operated by CINECA. The authors would like to express their deepest gratitude to KSTAR Team for the extensive supports on the RMP–ELM suppression experiment. This material was supported by the U.S. Department of Energy, under Awards DE-SC0020372 & DE-AC52-07NA27344. This work was also supported by the U.S. Department of Energy under contract number DE-AC02-09CH11466 (Princeton Plasma Physics Laboratory). The United States Government retains a non-exclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript or allow others to do so for United States Government purposes. This research was also supported by R&D Program of ‘KSTAR Experimental Collaboration and Fusion Plasma Research (EN2201-13)’ through the Korea Institute of Fusion Energy (KFE) funded by the Government funds. Computing resources were provided on the KFE computer, KAIROS, funded by the Ministry of Science and ICT of the Republic of Korea (KFE-EN2241-8). Part of this work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training program 2014–2018 and 2019–2020 under Grant Agreement No. 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. This work was partly carried out the Marconi-Fusion supercomputer operated by CINECA.

Financiers	Financiernummer
CINECA
Euratom Research and Training Programme 2014-2018
KSTAR Experimental Collaboration and Fusion Plasma Research	EN2201-13
Korea Institute of Fusion Energy
Ministry of Science and ICT of the Republic of Korea	KFE-EN2241-8
U.S. Department of Energy	DE-SC0020372, DE-AC02-09CH11466, DE-AC52-07NA27344
European Union’s Horizon Europe research and innovation programme	633053
H2020 Euratom
Princeton Plasma Physics Laboratory (PPPL)

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Kim, S. K., Pamela, S., Logan, N., Na, Y. S., Lee, C., Park, J. K., Yang, S., Hu, Q., Becoulet, M., Huijsmans, G., Hoelzl, M., In, Y., Kim, M. W., Lee, H. H., Lee, J. H., Lee, J. H., Kwon, O., & Kolemen, E. (2022). Nonlinear MHD modeling of n = 1 RMP-induced pedestal transport and mode coupling effects on ELM suppression in KSTAR. Nuclear Fusion, 62(10), Artikel 106021. https://doi.org/10.1088/1741-4326/ac84ef

@article{2b8e4b3493d448a3825f7bda31c2a539,

title = "Nonlinear MHD modeling of n = 1 RMP-induced pedestal transport and mode coupling effects on ELM suppression in KSTAR",

abstract = "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.",

keywords = "edge localized mode, KSTAR, mode coupling, neoclassical toroidal viscosity, nonlinear MHD, peeling ballooning mode, RMP",

author = "S.K. Kim and S. Pamela and N. Logan and Y.S. Na and C. Lee and J.K. Park and S. Yang and Q. Hu and M. Becoulet and G. Huijsmans and M. Hoelzl and Y. In and M.W. Kim and H.H. Lee and J.H. Lee and Lee, {J. H.} and O. Kwon and E. Kolemen",

note = "Funding Information: The authors would like to express their deepest gratitude to KSTAR Team for the extensive supports on the RMP-ELM suppression experiment. This material was supported by the U.S. Department of Energy, under Awards DE-SC0020372 & DE-AC52-07NA27344. This work was also supported by the U.S. Department of Energy under contract number DE-AC02-09CH11466 (Princeton Plasma Physics Laboratory). The United States Government retains a non-exclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript or allow others to do so for United States Government purposes. This research was also supported by R&D Program of {\textquoteleft}KSTAR Experimental Collaboration and Fusion Plasma Research (EN2201-13){\textquoteright} through the Korea Institute of Fusion Energy (KFE) funded by the Government funds. Computing resources were provided on the KFE computer, KAIROS, funded by the Ministry of Science and ICT of the Republic of Korea (KFE-EN2241-8). Part of this work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training program 2014-2018 and 2019-2020 under Grant Agreement No. 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. This work was partly carried out the Marconi-Fusion supercomputer operated by CINECA. Funding Information: The authors would like to express their deepest gratitude to KSTAR Team for the extensive supports on the RMP–ELM suppression experiment. This material was supported by the U.S. Department of Energy, under Awards DE-SC0020372 & DE-AC52-07NA27344. This work was also supported by the U.S. Department of Energy under contract number DE-AC02-09CH11466 (Princeton Plasma Physics Laboratory). The United States Government retains a non-exclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript or allow others to do so for United States Government purposes. This research was also supported by R&D Program of {\textquoteleft}KSTAR Experimental Collaboration and Fusion Plasma Research (EN2201-13){\textquoteright} through the Korea Institute of Fusion Energy (KFE) funded by the Government funds. Computing resources were provided on the KFE computer, KAIROS, funded by the Ministry of Science and ICT of the Republic of Korea (KFE-EN2241-8). Part of this work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training program 2014–2018 and 2019–2020 under Grant Agreement No. 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. This work was partly carried out the Marconi-Fusion supercomputer operated by CINECA. Publisher Copyright: {\textcopyright} 2022 IAEA, Vienna.",

year = "2022",

month = dec,

doi = "10.1088/1741-4326/ac84ef",

language = "English",

volume = "62",

journal = "Nuclear Fusion",

issn = "0029-5515",

publisher = "Institute of Physics",

number = "10",

}

Kim, SK, Pamela, S, Logan, N, Na, YS, Lee, C, Park, JK, Yang, S, Hu, Q, Becoulet, M, Huijsmans, G, Hoelzl, M, In, Y, Kim, MW, Lee, HH, Lee, JH, Lee, JH, Kwon, O & Kolemen, E 2022, 'Nonlinear MHD modeling of n = 1 RMP-induced pedestal transport and mode coupling effects on ELM suppression in KSTAR', Nuclear Fusion, vol. 62, nr. 10, 106021. https://doi.org/10.1088/1741-4326/ac84ef

TY - JOUR

T1 - Nonlinear MHD modeling of n = 1 RMP-induced pedestal transport and mode coupling effects on ELM suppression in KSTAR

AU - Kim, S.K.

AU - Pamela, S.

AU - Logan, N.

AU - Na, Y.S.

AU - Lee, C.

AU - Park, J.K.

AU - Yang, S.

AU - Hu, Q.

AU - Becoulet, M.

AU - Huijsmans, G.

AU - Hoelzl, M.

AU - In, Y.

AU - Kim, M.W.

AU - Lee, H.H.

AU - Lee, J.H.

AU - Lee, J. H.

AU - Kwon, O.

AU - Kolemen, E.

N1 - Funding Information: The authors would like to express their deepest gratitude to KSTAR Team for the extensive supports on the RMP-ELM suppression experiment. This material was supported by the U.S. Department of Energy, under Awards DE-SC0020372 & DE-AC52-07NA27344. This work was also supported by the U.S. Department of Energy under contract number DE-AC02-09CH11466 (Princeton Plasma Physics Laboratory). The United States Government retains a non-exclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript or allow others to do so for United States Government purposes. This research was also supported by R&D Program of ‘KSTAR Experimental Collaboration and Fusion Plasma Research (EN2201-13)’ through the Korea Institute of Fusion Energy (KFE) funded by the Government funds. Computing resources were provided on the KFE computer, KAIROS, funded by the Ministry of Science and ICT of the Republic of Korea (KFE-EN2241-8). Part of this work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training program 2014-2018 and 2019-2020 under Grant Agreement No. 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. This work was partly carried out the Marconi-Fusion supercomputer operated by CINECA. Funding Information: The authors would like to express their deepest gratitude to KSTAR Team for the extensive supports on the RMP–ELM suppression experiment. This material was supported by the U.S. Department of Energy, under Awards DE-SC0020372 & DE-AC52-07NA27344. This work was also supported by the U.S. Department of Energy under contract number DE-AC02-09CH11466 (Princeton Plasma Physics Laboratory). The United States Government retains a non-exclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript or allow others to do so for United States Government purposes. This research was also supported by R&D Program of ‘KSTAR Experimental Collaboration and Fusion Plasma Research (EN2201-13)’ through the Korea Institute of Fusion Energy (KFE) funded by the Government funds. Computing resources were provided on the KFE computer, KAIROS, funded by the Ministry of Science and ICT of the Republic of Korea (KFE-EN2241-8). Part of this work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training program 2014–2018 and 2019–2020 under Grant Agreement No. 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. This work was partly carried out the Marconi-Fusion supercomputer operated by CINECA. Publisher Copyright: © 2022 IAEA, Vienna.

PY - 2022/12

Y1 - 2022/12

N2 - 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.

AB - 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.

KW - edge localized mode

KW - KSTAR

KW - mode coupling

KW - neoclassical toroidal viscosity

KW - nonlinear MHD

KW - peeling ballooning mode

KW - RMP

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U2 - 10.1088/1741-4326/ac84ef

DO - 10.1088/1741-4326/ac84ef

M3 - Article

AN - SCOPUS:85138207958

SN - 0029-5515

VL - 62

JO - Nuclear Fusion

JF - Nuclear Fusion

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ER -

Nonlinear MHD modeling of n = 1 RMP-induced pedestal transport and mode coupling effects on ELM suppression in KSTAR

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