BOUT++ nonlinear simulation for a comparative study with the measured 2D ELM structures in the KSTAR H-mode plasma

Kim, M.; Park, H. K.; Lee, J.; Yun, G. S.; Xu, X. Q.; Bécoulet, M.

doi:10.1063/1.5085891

BOUT++ nonlinear simulation for a comparative study with the measured 2D ELM structures in the KSTAR H-mode plasma

Journal Article · Wed May 01 00:00:00 EDT 2019 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5085891· OSTI ID:1568014

^[1]; Park, H. K. ^[2]; ^[1]; ^[3]; ^[4]; Bécoulet, M. ^[5]

National Fusion Research Inst., Daejeon (South Korea)
Ulsan National Inst. of Science and Technology (South Korea)
Pohang Univ. of Science and Technology (South Korea)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Alternative Energies and Atomic Energy Commission (CEA), Saint-Paul-Lez-Durance (France)

Here, time-dependent nonlinear simulation using the BOUT++ 3-field model is performed for a study of edge localized mode (ELM) dynamics in KSTAR H-mode plasmas. The simulated results of the ELM evolution are directly compared with the 2D ELM structures, measured by electron cyclotron emission imaging systems, from the initial growth to crash phase. The simulation results are qualitatively in good agreement with the observations. Specifically, it is notable in simulation and experiment that higher-n modes in a quasi-steady state phase evolve into lower-n modes close to the ELM-crash in time. It indicates that lower-n modes may be responsible for the onset of the crash. A postanalysis confirms that nonlinear mode coupling between toroidal harmonics may drive the lower-n mode.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: National Research Foundation (NRF) of Korea; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1568014

Report Number(s):: LLNL-JRNL--789212; 987558

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 26; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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