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

Hongyu WANG (王虹宇); Pengfei LIU (刘鹏飞); Zhihong LIN (林志宏); Wenlu ZHANG (张文禄)

doi:10.1088/2058-6272/abc871

Plasma Science and Technology > 2021 > 23(1): 15101-015101. > DOI: 10.1088/2058-6272/abc871

Hongyu WANG (王虹宇), Pengfei LIU (刘鹏飞), Zhihong LIN (林志宏), Wenlu ZHANG (张文禄). Linear gyrokinetic simulations of reversed shear Alfvén eigenmodes and ion temperature gradient modes in DIII-D tokamak[J]. Plasma Science and Technology, 2021, 23(1): 15101-015101. DOI: 10.1088/2058-6272/abc871

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

¹ Fusion Simulation Center, Peking University, Beijing 100871, People's Republic of China
² Department of Physics and Astronomy, University of California, Irvine, CA 92697, United States of America
³ Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China

Funds: This work was supported by the China National Magnetic Confinement Fusion Science Program (Grant No. 2018YFE0304100), the US Department of Energy, Office of Science, Office of Advanced Scientific Computing Research and Office of Fusion Energy Sciences, and the Scientific Discovery through Advanced Computing (SciDAC) program under Award No. DE-SC0018270 (SciDAC ISEP Center), and the China Scholarship Council (Grant No. 201806010067). This work used resources of the Oak Ridge Leadership Computing Facility at the Oak Ridge National Laboratory (DOE Contract No. DEAC05-00OR22725) and the National Energy Research Scientific Computing Center (DOE Contract No. DE-AC02-05CH11231).

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Received Date: July 27, 2020
Revised Date: November 04, 2020
Accepted Date: November 05, 2020

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Abstract

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 number n and electromagnetic ion temperature gradient (ITG) instabilities with higher toroidal mode number n. For intermediate n=[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.
- fast ions,
- gyrokinetic simulation,
- reversed shear Alfvén eigenmodes,
- microturbulence

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References (43)

References

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1.	Liu, P., Wei, X., Lin, Z. et al. Cross-scale interaction between microturbulence and meso-scale reversed shear Alfvén eigenmodes in DIII-D plasmas. Nuclear Fusion, 2024, 64(7): 076007. DOI:10.1088/1741-4326/ad4809
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3.	Liu, P., Wei, X., Lin, Z. et al. Regulation of Alfvén Eigenmodes by Microturbulence in Fusion Plasmas. Physical Review Letters, 2022, 128(18): 185001. DOI:10.1103/PhysRevLett.128.185001

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