Global gyrokinetic simulation with kinetic electron for collisionless damping of zonal flow in stellarators

Nicolau, Javier H.; Choi, Gyungjin; Fu, Jingyuan; Liu, Pengfei; Wei, Xishuo; Lin, Zhihong

doi:10.1088/1741-4326/ac31da

Global gyrokinetic simulation with kinetic electron for collisionless damping of zonal flow in stellarators

Journal Article · Fri Nov 12 00:00:00 EST 2021 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ac31da· OSTI ID:1979399

^[1]; ^[2]; ^[3]; Liu, Pengfei ^[2]; ^[2]; ^[2]

University of California, Irvine, CA (United States); OSTI
University of California, Irvine, CA (United States)
Peking University, Beijing (China)

Global gyrokinetic simulations with kinetic electrons for collisionless damping of zonal flows in LHD and W7-X stellarators show that the helical components of the equilibrium magnetic field responsible for helically trapped particles have significant impacts on zonal flow. Kinetic electrons reduce zonal flow residue and increase the frequency of low frequency oscillation (LFO). Here, the LFO is induced by dominant helical harmonics of magnetic field strength. Furthermore, linear toroidal coupling of multiple toroidal n-harmonics barely affects the zonal flows, but can generate long wavelength toroidal harmonics with the same toroidal number as the helical magnetic field.

View Accepted Manuscript (DOE)

Research Organization:: UT-Battelle LLC/ORNL, Oak Ridge, TN (United States); University of California, Irvine, CA (United States); University of California, Oakland, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231; AC05-00OR22725; FG02-07ER54916; SC0018270; SC0020413

OSTI ID:: 1979399

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 12 Vol. 61; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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