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Title: Numerical study of transition between even and odd toroidal Alfvén eigenmodes on EAST

Abstract

In this work, linear simulations of toroidal Alfvén eigenmodes (TAEs) driven by energetic particles (EPs) on EAST (Experimental Advanced Superconducting Tokamak) are performed using the hybrid-kinetic MHD model implemented in NIMROD code. Furthermore, the EAST equilibrium is reconstructed using the EFIT code based on the experimental measurement. The “slowing down” distribution is adopted for modeling the equilibrium distribution of the energetic ions from the deuterium neutral beam injection on EAST. The frequency, the dominant poloidal mode number, the radial location and the detailed 2D mode structure of the TAE/RSAE (Reverse Shear Alfvén Eigenmode)/EPM (energetic particle mode) modes are consistent between the eigenvalue analysis and the NIMROD simulation. As the β fraction of EP increases, a transition between even and odd TAEs occurs, along with that between the ballooning and antiballooning mode structures. It is demonstrated that when the β fraction of EP is close to the transition threshold, both types of TAEs coexist.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3];  [4]; ORCiD logo [5];  [4]
  1. University of Science and Technology of China, Hefei (China)
  2. SLS2 Consulting, San Diego, CA (United States)
  3. Huazhong University of Science and Technology, Wuhan (China); Univ. of Wisconsin, Madison, WI (United States); University of Science and Technology of China, Hefei (China)
  4. University of Science and Technology of China, Hefei (China)
  5. Chinese Academy of Sciences (CAS), Hefei (China)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States); Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Natural Science Foundation of China (NSFC)
Contributing Org.:
NIMROD Team
OSTI Identifier:
1577600
Alternate Identifier(s):
OSTI ID: 1568916
Grant/Contract Number:  
AC02-05CH11231; FG02-86ER53218; SC0018001; 13DE-AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 26; Journal Issue: 8; 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; Plasma confinement; Plasma waves; Tokamaks; Plasma codes; Plasma instabilities; Magnetohydrodynamics; Computational methods; Fusion reactors; Computational models

Citation Formats

Hou, Yawei, Kim, Charlson C., Zhu, Ping, Zou, Zhihui, Hu, Youjun, and Yan, Xingting. Numerical study of transition between even and odd toroidal Alfvén eigenmodes on EAST. United States: N. p., 2019. Web. doi:10.1063/1.5108693.
Hou, Yawei, Kim, Charlson C., Zhu, Ping, Zou, Zhihui, Hu, Youjun, & Yan, Xingting. Numerical study of transition between even and odd toroidal Alfvén eigenmodes on EAST. United States. https://doi.org/10.1063/1.5108693
Hou, Yawei, Kim, Charlson C., Zhu, Ping, Zou, Zhihui, Hu, Youjun, and Yan, Xingting. Fri . "Numerical study of transition between even and odd toroidal Alfvén eigenmodes on EAST". United States. https://doi.org/10.1063/1.5108693. https://www.osti.gov/servlets/purl/1577600.
@article{osti_1577600,
title = {Numerical study of transition between even and odd toroidal Alfvén eigenmodes on EAST},
author = {Hou, Yawei and Kim, Charlson C. and Zhu, Ping and Zou, Zhihui and Hu, Youjun and Yan, Xingting},
abstractNote = {In this work, linear simulations of toroidal Alfvén eigenmodes (TAEs) driven by energetic particles (EPs) on EAST (Experimental Advanced Superconducting Tokamak) are performed using the hybrid-kinetic MHD model implemented in NIMROD code. Furthermore, the EAST equilibrium is reconstructed using the EFIT code based on the experimental measurement. The “slowing down” distribution is adopted for modeling the equilibrium distribution of the energetic ions from the deuterium neutral beam injection on EAST. The frequency, the dominant poloidal mode number, the radial location and the detailed 2D mode structure of the TAE/RSAE (Reverse Shear Alfvén Eigenmode)/EPM (energetic particle mode) modes are consistent between the eigenvalue analysis and the NIMROD simulation. As the β fraction of EP increases, a transition between even and odd TAEs occurs, along with that between the ballooning and antiballooning mode structures. It is demonstrated that when the β fraction of EP is close to the transition threshold, both types of TAEs coexist.},
doi = {10.1063/1.5108693},
journal = {Physics of Plasmas},
number = 8,
volume = 26,
place = {United States},
year = {Fri Aug 16 00:00:00 EDT 2019},
month = {Fri Aug 16 00:00:00 EDT 2019}
}

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