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Influence of Off-Axis Neutral Beam Injection on Resistive Wall Mode Stability

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Abstract

Investigated are the effects of energetic particles (EPs), arising from off-axis neutral beam injection, on the resistive wall mode (RWM) instability in tokamaks. The analytic results for a cylindrical plasma show that EPs contribute the strongest kinetic damping to the RWM, as the deposition radius approaches the peak location of the mode eigenfunction. Toroidal computations are also carried out utilizing the MARS-K code, which includes EPs with anisotropic equilibrium distribution in the particle pitch angle space. These self-consistent numerical results confirm the analytic finding, that the RWM growth rate decreases as the peak of the EPs’ radial density profile approaches the maximum of the mode displacement. This study thus demonstrates the possibility of the RWM stabilization by the off-axis neutral beam injection in tokamak experiments.

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Acknowledgements

This work was supported by National Natural Science Foundation of China under Grant No. 11775067 and also supported by National Magnetic Confinement Fusion Science Program under Grant Nos. 2018YFE0304103. Work was also partly supported by US DoE Office of Science under Contract DE-FG02-95ER54309.

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Authors and Affiliations

  1. Southwestern Institute of Physics, Post Office Box 432, Chengdu, 610041, China

    G. Z. Hao, A. K. Wang & X. M. Qiu

  2. General Atomics, PO Box 85608, San Diego, CA, 92186-5608, USA

    Y. Q. Liu

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  1. G. Z. Hao
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  2. Y. Q. Liu
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  3. A. K. Wang
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  4. X. M. Qiu
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Correspondence to G. Z. Hao.

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Hao, G.Z., Liu, Y.Q., Wang, A.K. et al. Influence of Off-Axis Neutral Beam Injection on Resistive Wall Mode Stability. J Fusion Energ 40, 7 (2021). https://doi.org/10.1007/s10894-021-00300-w

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  • DOI: https://doi.org/10.1007/s10894-021-00300-w

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