Global gyrokinetic particle simulations of microturbulence in W7-X and LHD stellarators

Wang, H Y.; Holod, I.; Lin, Zhihong; Bao, Jian; Fu, Jing Yuan; Liu, Pengfei; Nicolau, Javier H.; Spong, Donald; Xiao, Yong

doi:10.1063/5.0014198

Title: Global gyrokinetic particle simulations of microturbulence in W7-X and LHD stellarators

Journal Article · Thu Aug 13 00:00:00 EDT 2020 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0014198· OSTI ID:1657905

Wang, H Y. ^[1]; Holod, I. ^[2];

^[3]; Bao, Jian ^[4]; Fu, Jing Yuan ^[5]; Liu, Pengfei ^[3];

^[3];

^[6];

^[7]

Peking Univ., Beijing (China); Univ. of California, Irvine, CA (United States)
Univ. of California, Irvine, CA (United States); Max Planck Computing and Data Facility, Garching (Germany)
Univ. of California, Irvine, CA (United States)
Univ. of California, Irvine, CA (United States); Chinese Academy of Sciences (CAS), Beijing (China)
Peking Univ., Beijing (China)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Zhejiang Univ., Hangzhou (China)

Global gyrokinetic particle simulations of electrostatic ion temperature gradient (ITG) instability show that the most unstable eigenmode is localized to some magnetic fieldlines or discrete locations on the poloidal plane in the Wendelstein 7-X (W7-X) stellarator due to its mirror-like magnetic fields, which vary strongly in the toroidal direction and induce coupling of more toroidal harmonics (n) to form the linear eigenmode than in the Large Helical Device (LHD) stellarator. Nonlinear electrostatic simulation results show that self-generated zonal flows are the dominant saturation mechanism for the ITG instabilities in both the LHD and W7-X. Additionally, radial widths of the fluctuation intensity in both the LHD and W7-X are significantly broadened from the linear phase to the nonlinear phase due to turbulence spreading. Finally, nonlinear spectra in the W7-X are dominated by low-n harmonics, which can be generated both by nonlinear toroidal coupling of high-n harmonics and by linear toroidal coupling with large amplitude zonal flows due to the 3D equilibrium magnetic fields.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (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), Fusion Energy Sciences (FES); China Scholarship Council (CSC)

Grant/Contract Number:: AC05-00OR22725; 2018YFE0304100; SC0018270; 201806010067; AC02-05CH11231

OSTI ID:: 1657905

Journal Information:: Physics of Plasmas, Vol. 27, Issue 8; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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