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Enhancement of Energetic-Electron Population During Magnetic Reconnection Associated with Strong Tearing Mode in Non-Disruptive HL-2A Plasmas

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Abstract

Laboratory observations of enhancements of energetic-electron population are presented during magnetic reconnection associated with strong tearing mode in non-disruptive tokamak plasmas. The hard X‑ray (HXR) spectrum detected by cadmium-telluride (CdTe) scintillator detectors and the non-thermal radiation measured by the electron cyclotron emission (ECE) are used to analyze the behaviors of energetic electrons on HL-2A. A population of energetic electrons is generated by parallel electric fields \({{E}_{\parallel }}\) during magnetic reconnection, which is evidenced by the production of hard X-rays with energy 10 keV < Eγ < 200 keV. The results could assist to better understand the acceleration mechanism of electrons in the parameter-regime of tokamak plasma. It is observed that the energetic-electrons jointly accelerated by Ohmic electric fields and parallel electric fields have significant effects on the behaviors of low frequency MHD modes, namely, which excite Alfvénic and acoustic type instabilities during strong tearing modes (TMs).

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ACKNOWLEDGMENTS

The authors (Q.L.Yang) sincerely thanks Mr. Wei Chen for the instruction in the past two years and are very grateful to the HL-2A experiment team.

Funding

This work is supported in part by the Natoinal Key R&D Program of China (grant nos. 2019YFE03020000 and 2018YEE0304102), by National Natural Science Foundation of China (grant nos. 12125502, 11875021, and 11835010), and by Sichuan Foundation (grant no. 2020JDJQ0070).

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Authors and Affiliations

  1. Southwestern Institute of Physics, P.O. Box 432, 610041, Chengdu, China

    Q.-L. Yang, W. Chen, L.-M. Yu, P.-W. Shi, X.-Q. Ji & Zh.-B. Shi

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  1. Q.-L. Yang
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  2. W. Chen
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  3. L.-M. Yu
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  4. P.-W. Shi
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  5. X.-Q. Ji
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Correspondence to W. Chen.

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Yang, QL., Chen, W., Yu, LM. et al. Enhancement of Energetic-Electron Population During Magnetic Reconnection Associated with Strong Tearing Mode in Non-Disruptive HL-2A Plasmas. Plasma Phys. Rep. 49, 1243–1250 (2023). https://doi.org/10.1134/S1063780X22602127

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