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The combined current drive of the lower hybrid wave and the high harmonic fast wave under the influence of the radial transport of fast electrons

  • Original Paper - Fluids, Plasma and Phenomenology
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Abstract

The combined current drive (CD) of the lower hybrid wave (LHW) and the high harmonic fast wave (HHFW) is investigated theoretically under the influence of the radial transport of fast electrons in DIII-D. The simulation results show that the combined CD of the LHW and the HHFW has a significant synergy effect even though the radial transport of fast electrons is considered. Positive or negative synergy effects occur in current driven by the combined LHW and HHFW when different frequencies and parallel refractive indices of the LHW and the HHFW are adopted. The relatively ideal total driven current is 375 kA with a synergy current of 150 kA, and the synergy factor for the driven current is 1.66. In addition, it is found that the synergy effect is not limited to the CD but also has a positive synergy effect on the power deposition. The additional deposition power not only accelerates more electrons in the parallel direction and forms a larger driven current, but it also plays a role in the acceleration of electrons in the vertical direction, which may also have a synergy effect on the heating of the plasma.

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Acknowledgements

The authors acknowledge the DIII-D group gratefully for their support. This work received assistance from the National Magnetic Confinement Fusion Program of China with Grant Nos. 2018YFE0311300 and 2022YFE03090001 and the National Natural Science Foundation of China under Grant Nos. 12075114 and 12375220. This study was funded by the Natural Science Foundation of Hunan Province, No.2022JJ50157 and PhD research startup foundation No. 190XQD123 as well.

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Authors and Affiliations

  1. University of South China, Hengyang, 421001, China

    Fangbei Zhou, Lan Yin, Pingwei Zheng, Xueyu Gong, Yijun Zhong, Xianghui Yin, You Chen, Chengyi Song & Wankun Ma

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  1. Fangbei Zhou
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  2. Lan Yin
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Correspondence to Lan Yin.

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Zhou, F., Yin, L., Zheng, P. et al. The combined current drive of the lower hybrid wave and the high harmonic fast wave under the influence of the radial transport of fast electrons. J. Korean Phys. Soc. 84, 618–625 (2024). https://doi.org/10.1007/s40042-024-01043-5

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