Numerical study of transition between even and odd toroidal Alfvén eigenmodes on EAST
[1];
[3];
[5];
- University of Science and Technology of China, Hefei (China)
- SLS2 Consulting, San Diego, CA (United States)
- Huazhong University of Science and Technology, Wuhan (China); Univ. of Wisconsin, Madison, WI (United States); University of Science and Technology of China, Hefei (China)
- University of Science and Technology of China, Hefei (China)
- Chinese Academy of Sciences (CAS), Hefei (China)
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.
- Research Organization:
- 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 Organization:
- USDOE Office of Science (SC); National Natural Science Foundation of China (NNSFC)
- Contributing Organization:
- NIMROD Team
- Grant/Contract Number:
- AC02-05CH11231; FG02-86ER53218; SC0018001
- OSTI ID:
- 1577600
- Journal Information:
- Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 8 Vol. 26; ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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