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Discrete Alfvén Eigenmodes in ITER Plasmas with Bootstrap Current

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Abstract

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 Alfvén eigenmodes (α-induced Alfvén 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 Alfvén eigenmodes. These discrete Alfvén 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 Alfvén eigenmodes in those typical scenarios, and find high-order modes trapped by the lower potential well. Discrete Alfvén eigenmodes exist widely in ITER scenarios with bootstrap current. However, discrete Alfvén eigenmodes are quasi-marginally stable in MHD description and could be readily destabilized by energetic particles in hybrid simulation via wave-particle resonances.

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Acknowledgements

This work is mainly supported by the National Natural Science Foundation of China (Grant Nos. 11645004 and 11275053) and Innovation Fund for graduate students of Guizhou University (Grant No. Science and Engineering for graduate students 2017035).

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Authors and Affiliations

  1. College of Physics, Guizhou University, Guiyang, People’s Republic of China

    Hao Wu, Shuanghui Hu, Qiuming He, Zilong Zhao & Li Jiang

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  1. Hao Wu
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  2. Shuanghui Hu
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  3. Qiuming He
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  4. Zilong Zhao
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  5. Li Jiang
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Correspondence to Hao Wu.

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Wu, H., Hu, S., He, Q. et al. Discrete Alfvén Eigenmodes in ITER Plasmas with Bootstrap Current. J Fusion Energ 37, 238–246 (2018). https://doi.org/10.1007/s10894-018-0175-0

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