Discrete Alfvén Eigenmodes in ITER Plasmas with Bootstrap Current
| Autor: | Qiuming He, Li Jiang, Hao Wu, Zilong Zhao, Shuanghui Hu |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Nuclear and High Energy Physics Fluid mechanics Plasma 01 natural sciences Electromagnetic radiation 010305 fluids & plasmas Computational physics Bootstrap current Nuclear Energy and Engineering Physics::Plasma Physics Physics::Space Physics 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Nuclear fusion Magnetohydrodynamic drive Radio frequency Magnetohydrodynamics 010306 general physics |
| Zdroj: | Journal of Fusion Energy. 37:238-246 |
| ISSN: | 1572-9591 0164-0313 |
| DOI: | 10.1007/s10894-018-0175-0 |
| Popis: | There is an important relationship between gradient of pressure and the bootstrap current. Due to the α (a gradient scale of pressure) is the essential condition to trap discrete Alfven eigenmodes (α-induced Alfven eigenmodes, namely αTAEs), here, we focus on the relationship between αTAEs and bootstrap current with a magnetohydrodynamic (MHD) simulation code and a gyrokinetic-MHD hybrid simulation code in two typical scenarios in ITER, and compare these typical scenarios with two ordinary scenarios about physical characteristics of discrete Alfven eigenmodes. These discrete Alfven eigenmodes are always lying in the region of high bootstrap current. However, they are not corresponding absolutely in pure radio frequency scenario (one of typical scenarios) because of large-α. Moreover, we illustrate the multiple branches of discrete Alfven eigenmodes in those typical scenarios, and find high-order modes trapped by the lower potential well. Discrete Alfven eigenmodes exist widely in ITER scenarios with bootstrap current. However, discrete Alfven eigenmodes are quasi-marginally stable in MHD description and could be readily destabilized by energetic particles in hybrid simulation via wave-particle resonances. |
| Databáze: | OpenAIRE |
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