Global gyrokinetic simulation of neoclassical ambipolar electric field and its effects on microturbulence in W7-X stellarator

Fu, J. Y.; Nicolau, J. H.; Liu, P. F.; Wei, X. S.; Xiao, Y.; Lin, Z.

doi:10.1063/5.0047291

Global gyrokinetic simulation of neoclassical ambipolar electric field and its effects on microturbulence in W7-X stellarator

Journal Article · Wed Jun 23 00:00:00 EDT 2021 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0047291· OSTI ID:1852573

^[1]; ^[2]; Liu, P. F. ^[2]; ^[2]; ^[3]; ^[2]

Peking University, Beijing (China); University of California, Irvine, CA (United States); Univ. of California, Irvine, CA (United States)
University of California, Irvine, CA (United States)
Zhejiang Univ., Hangzhou (China)

Global neoclassical simulations of a model equilibrium of the W7-X stellarator find an ambipolar electric field with either an ion root or an electron root solution depending on the temperature ratio between electrons and ions. The ambipolar electric field is then used as an equilibrium field in the turbulence simulations of ion temperature gradient (ITG) instability. The shear of the ambipolar electric field has modest effects on the ITG linear instability, nonlinear saturation amplitude, and turbulent transport in the ion root case. However, in the electron root case, the ambipolar electric field significantly reduces the linear ITG growth rate, turbulence intensity, and radial correlation length, resulting in an ion heat conductivity comparable to the neoclassical transport level in the strong shear region.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); University of California, Irvine, CA (United States); University of California, Oakland, CA (United States)

Sponsoring Organization:: China National Magnetic Confinement Fusion Science Program; National Energy Research Scientific Computing Center; USDOE; USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC02-05CH11231; AC05-00OR22725; SC0018270; SC0020413

OSTI ID:: 1852573

Alternate ID(s):: OSTI ID: 1798251

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 6 Vol. 28; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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