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:
-
[1];
[2];
[3];
- 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)
- Publication Date:
- Research Org.:
- 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 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. https://doi.org/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. https://doi.org/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 = {Thu Sep 28 00:00:00 EDT 2017},
month = {Thu Sep 28 00:00:00 EDT 2017}
}
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Works referencing / citing this record:
Verification of an energetic-electron-driven β -induced Alfvén eigenmode in the HL-2A tokamak
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