Linear gyrokinetic simulations of reversed shear Alfvén eigenmodes and ion temperature gradient modes in DIII-D tokamak

WANG, Hongyu; LIU, Pengfei; LIN, Zhihong; ZHANG, Wenlu

doi:10.1088/2058-6272/abc871

Linear gyrokinetic simulations of reversed shear Alfvén eigenmodes and ion temperature gradient modes in DIII-D tokamak

Journal Article · Thu Dec 03 04:00:00 EST 2020 · Plasma Science and Technology

DOI:https://doi.org/10.1088/2058-6272/abc871· OSTI ID:1852572

WANG, Hongyu ^[1]; LIU, Pengfei; LIN, Zhihong; ZHANG, Wenlu

OSTI

Abstract

Global linear gyrokinetic simulations using realistic DIII-D tokamak geometry and plasma profiles find co-existence of unstable reversed shear Alfvén eigenmodes (RSAE) with low toroidal mode numbernand electromagnetic ion temperature gradient (ITG) instabilities with higher toroidal mode numbern. For intermediaten = [10, 12], RSAE and ITG co-exist and overlap weakly in the radial domain with similar growth rates but different real frequencies. Both RSAE and ITG growth rates decrease less than 5% when compressible magnetic perturbations are neglected in the simulations. The ITG growth rates increase less than 7% when fast ions are not included in the simulations. Finally, the effects of trapped electrons on the RSAE are negligible.

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

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: SC0018270; AC02-05CH11231; AC05-00OR22725

OSTI ID:: 1852572

Journal Information:: Plasma Science and Technology, Journal Name: Plasma Science and Technology Journal Issue: 1 Vol. 23; ISSN 1009-0630

Publisher:: IOPScience

Country of Publication:: United States

Language:: English

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