Global gyrokinetic particle simulations of microturbulence in W7-X and LHD stellarators
Abstract
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.
- Authors:
-
[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)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- 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)
- OSTI Identifier:
- 1657905
- Grant/Contract Number:
- AC05-00OR22725; 2018YFE0304100; SC0018270; 201806010067; AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 27; Journal Issue: 8; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Electrostatics; Gyrokinetic simulations; Stellarators; Wave mechanics; Plasma confinement; Turbulence simulations; Plasma instabilities; Transport properties
Citation Formats
Wang, H Y., Holod, I., Lin, Zhihong, Bao, Jian, Fu, Jing Yuan, Liu, Pengfei, Nicolau, Javier H., Spong, Donald, and Xiao, Yong. Global gyrokinetic particle simulations of microturbulence in W7-X and LHD stellarators. United States: N. p., 2020.
Web. doi:10.1063/5.0014198.
Wang, H Y., Holod, I., Lin, Zhihong, Bao, Jian, Fu, Jing Yuan, Liu, Pengfei, Nicolau, Javier H., Spong, Donald, & Xiao, Yong. Global gyrokinetic particle simulations of microturbulence in W7-X and LHD stellarators. United States. https://doi.org/10.1063/5.0014198
Wang, H Y., Holod, I., Lin, Zhihong, Bao, Jian, Fu, Jing Yuan, Liu, Pengfei, Nicolau, Javier H., Spong, Donald, and Xiao, Yong. Thu .
"Global gyrokinetic particle simulations of microturbulence in W7-X and LHD stellarators". United States. https://doi.org/10.1063/5.0014198. https://www.osti.gov/servlets/purl/1657905.
@article{osti_1657905,
title = {Global gyrokinetic particle simulations of microturbulence in W7-X and LHD stellarators},
author = {Wang, H Y. and Holod, I. and Lin, Zhihong and Bao, Jian and Fu, Jing Yuan and Liu, Pengfei and Nicolau, Javier H. and Spong, Donald and Xiao, Yong},
abstractNote = {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.},
doi = {10.1063/5.0014198},
journal = {Physics of Plasmas},
number = 8,
volume = 27,
place = {United States},
year = {Thu Aug 13 00:00:00 EDT 2020},
month = {Thu Aug 13 00:00:00 EDT 2020}
}
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