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

Abstract

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.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [1];  [4];  [4]
  1. Univ. of Science and Technology of China, Hefei (China); Chinese Academy of Sciences (CAS), Beijing (China)
  2. Univ. of Science and Technology of China, Hefei (China); Chinese Academy of Sciences (CAS), Beijing (China); Univ. of California, Irvine, CA (United States)
  3. Univ. of California, Irvine, CA (United States); Peking Univ., Beijing (China)
  4. Chinese Academy of Sciences (CAS), Beijing (China)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Lawrence Berkeley National Laboratory (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 (Unted States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1543847
Alternate Identifier(s):
OSTI ID: 1395383
Grant/Contract Number:  
AC02-05CH11231; AC05-00OR22725; AC02-05-CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 9; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Cheng, Junyi, Zhang, Wenlu, Lin, Zhihong, Li, Ding, Dong, Chao, and Cao, Jintao. Nonlinear co-existence of beta-induced Alfvén eigenmodes and beta-induced Alfvén-acoustic eigenmodes. United States: N. p., 2017. Web. doi:10.1063/1.5004676.
Cheng, Junyi, Zhang, Wenlu, Lin, Zhihong, Li, Ding, Dong, Chao, & Cao, Jintao. Nonlinear co-existence of beta-induced Alfvén eigenmodes and beta-induced Alfvén-acoustic eigenmodes. United States. doi:10.1063/1.5004676.
Cheng, Junyi, Zhang, Wenlu, Lin, Zhihong, Li, Ding, Dong, Chao, and Cao, Jintao. Thu . "Nonlinear co-existence of beta-induced Alfvén eigenmodes and beta-induced Alfvén-acoustic eigenmodes". United States. doi:10.1063/1.5004676. https://www.osti.gov/servlets/purl/1543847.
@article{osti_1543847,
title = {Nonlinear co-existence of beta-induced Alfvén eigenmodes and beta-induced Alfvén-acoustic eigenmodes},
author = {Cheng, Junyi and Zhang, Wenlu and Lin, Zhihong and Li, Ding and Dong, Chao and Cao, Jintao},
abstractNote = {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.},
doi = {10.1063/1.5004676},
journal = {Physics of Plasmas},
number = 9,
volume = 24,
place = {United States},
year = {2017},
month = {9}
}

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