Gyrokinetic particle simulations of interactions between energetic particles and magnetic islands induced by neoclassical tearing modes

Tang, X.; Lin, Z.; Heidbrink, W. W.; Bao, J.; Xiao, C.; Li, Z.; Li, J.; Bardóczi, L.

doi:10.1063/1.5126681

Gyrokinetic particle simulations of interactions between energetic particles and magnetic islands induced by neoclassical tearing modes

Journal Article · Tue Mar 24 00:00:00 EDT 2020 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5126681· OSTI ID:1782096

Tang, X. ^[1]; ^[2]; Heidbrink, W. W. ^[2]; Bao, J. ^[3]; Xiao, C. ^[4]; Li, Z. ^[5]; Li, J. ^[6]; Bardóczi, L. ^[5]

Peking Univ., Beijing (China); Univ. of California, Irvine, CA (United States); University of California, Irvine, CA (United States)
Univ. of California, Irvine, CA (United States)
Chinese Academy of Sciences (CAS), Beijing (China)
Peking Univ., Beijing (China)
General Atomics, San Diego, CA (United States)
Nankai Univ., Tianjin (China)

Interactions between energetic particles (EPs) and neoclassical tearing mode (NTM) islands in the DIII-D tokamak are studied using the global gyrokinetic toroidal code (GTC). GTC simulations find that the EP radial profile is partially flattened within the magnetic island regions and that there are stochastic regions in the particle phase space. Radial particle flux is induced mainly around the magnetic island regions and decreases with time to almost zero when the initial EP distribution achieves a new steady-state in the absence of EP sources. Stochastic regions of magnetic field lines induced by the superposition of multiple islands have weak effects on the particle flux when the width of stochastic regions is smaller than the EP drift orbit width. In conclusion, the perturbed parallel EP current induced by the magnetic islands has weak stabilizing effects on the linear growth rate of the NTM instability in this DIII-D experiment.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, Irvine, CA (United States)

Sponsoring Organization:: China National Magnetic Confinement Fusion Science Program; USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR). Scientific Discovery through Advanced Computing (SciDAC); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC02-05CH11231; AC05-00OR22725; FC02-04ER54698; SC0018270; SC0020337

OSTI ID:: 1782096

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 3 Vol. 27; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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