Excitation of low frequency Alfven eigenmodes in toroidal plasmas

Liu, Yaqi; Lin, Zhihong; Zhang, Huasen; Zhang, Wenlu

doi:10.1088/1741-4326/aa7d14

Excitation of low frequency Alfven eigenmodes in toroidal plasmas

Journal Article · Fri Jul 28 00:00:00 EDT 2017 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aa7d14· OSTI ID:1523623

Liu, Yaqi ^[1]; Lin, Zhihong ^[2]; Zhang, Huasen ^[3]; ^[4]

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

Global gyrokinetic simulations find that realistic density gradients of energetic particles can simultaneously excite low frequency Alfven eigenmodes in toroidal geometry, beta-induced Alfven-acoustic eigenmode (BAAE) and beta-induced Alfven eigenmode (BAE), with similar radial mode widths and comparable linear growth rates even though damping rate of BAAE is much larger than BAE in the absence of energetic particles. Here, this surprising result is attributed to non-perturbative effects of energetic particles that modify ideal BAAE mode polarizations and nonlocal geometry effects that invalidate radially local dispersion relation. Dominant mode changes from BAAE in a larger tokamak to BAE in a smaller tokamak due to the dependence of wave-particle resonance condition on the tokamak size.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)

Sponsoring Organization:: USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR). Scientific Discovery through Advanced Computing (SciDAC)

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

OSTI ID:: 1523623

Alternate ID(s):: OSTI ID: 22925916

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 11 Vol. 57; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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