Nonlinear co-existence of beta-induced Alfvén eigenmodes and beta-induced Alfvén-acoustic eigenmodes

Cheng, Junyi; Zhang, Wenlu; Lin, Zhihong; Li, Ding; Dong, Chao; Cao, Jintao

doi:10.1063/1.5004676

Title: Nonlinear co-existence of beta-induced Alfvén eigenmodes and beta-induced Alfvén-acoustic eigenmodes

Journal Article · Thu Sep 28 00:00:00 EDT 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5004676· OSTI ID:1543847

^[1];

^[2];

^[3]; Li, Ding ^[1]; Dong, Chao ^[4]; Cao, Jintao ^[4]

Univ. of Science and Technology of China, Hefei (China); Chinese Academy of Sciences (CAS), Beijing (China)
Univ. of Science and Technology of China, Hefei (China); Chinese Academy of Sciences (CAS), Beijing (China); Univ. of California, Irvine, CA (United States)
Univ. of California, Irvine, CA (United States); Peking Univ., Beijing (China)
Chinese Academy of Sciences (CAS), Beijing (China)

The nonlinear co-existence of β–induced Alfvén eigenmode (BAE) and β–induced Alfvén-acoustic eigenmode (BAAE) is found in simulations using the gyrokinetic toroidal code, which provides a new mechanism responsible for BAAE excitation in tokamaks. In this work, the normalized pressure β is the ratio between plasma thermal pressure and magnetic pressure. The nonlinear simulation findings show that the BAAE branch emerges after the BAE branch is saturated. The mode structure's evolution shows that existence of BAAE will change the original BAE mode structure. The perturbed distribution functions in the velocity phase space show that a new resonance region manifesting the wave-particle resonance in the BAAE branch appears during the nonlinear co-existence stage.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States); UT-Battelle LLC/ORNL, Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

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

OSTI ID:: 1543847

Alternate ID(s):: OSTI ID: 1395383

Journal Information:: Physics of Plasmas, Vol. 24, Issue 9; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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