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核工业西南物理研究院 ›› 2024, Vol. 44 ›› Issue (3): 328-333.DOI: 10.16568/j.0254-6086.202403013

• 等离子体物理 • 上一篇    下一篇

HL-3 装置欧姆等离子体中高频磁流体不稳定性的实验观测

杨秋磊,陈 伟* ,张 洁,程时葵,梁绍勇,张轶泼,HL-3 实验团队   

  1. (核工业西南物理研究院,成都 610041) 
  • 收稿日期:2023-03-22 修回日期:2023-12-11 出版日期:2024-09-15 发布日期:2024-09-13
  • 作者简介:杨秋磊(1995-),男,湖北随州人,硕士,从事聚变等离子体物理实验研究。
  • 基金资助:
    国家自然科学基金杰出青年项目(12125502);国家重点研发专项(2019YFE03020000) 

Observation of high-frequency magnetohydrodynamics instability in HL-3 Ohmic plasmas

YANG Qiu-lei, CHEN Wei, ZHANG Jie, CHENG Shi-kui, LIANG Shao-yong, ZHANG Yi-po, HL-3 Experimental Team    

  1. (Southwestern Institute of Physics, Chengdu 610041) 
  • Received:2023-03-22 Revised:2023-12-11 Online:2024-09-15 Published:2024-09-13

摘要: 在 HL-3 装置 1MA 电流等离子体欧姆放电实验期间,米尔诺夫(Mirnov)探针测量到两种高频磁流体(MHD)不稳定性。在等离子体启动阶段,电流爬升受到抑制,碘化钠探测器测量到逃逸电子增加。同时 Mirnov 探针测量到多分支频率 f 为 20~400kHz 的高频 MHD 不稳定性。结果表明,这种不稳定性的出现与逃逸电子增加密切相关,并抑制了等离子体电流的爬升,损失了大约 7%伏秒数。等离子体电流和密度爬升时,Mirnov 探针测量到频率 f 为 110~160kHz 的高频 MHD 不稳定性。这种不稳定性频率与芯部阿尔芬频率成正比,处于环向阿尔芬本征模频率范围。随着这种不稳定性的演化,等离子体发生了破裂。这些高频 MHD 不稳定性的研究对于 HL-3 后续放电及未来 ITER 的初始放电有重要的参考意义。

关键词: 等离子体, 磁流体不稳定性, 逃逸电子, 破裂

Abstract: This article describes the experimental observation obtained from HL-3 Ohmic plasma, using magnetic probe diagnostics. This measurement reveals the presence of two type high-frequency magnetohydrodynamics (MHD) instability in plasma. During the plasma start-up phase, the current rise is inhibited at t≈40ms and sodium iodide (NaI) detector measures enhancement of runaway electrons. At the same time magnetic probe diagnostics measure multi-branch upward-swept high-frequency MHD instability with a frequency range of f  is 20~400kHz. The results indicate that the instability, which is related to enhancement of runaway electrons, inhibits the plasma current rise with a loss of about 7% volt-second. When the plasma current and density are in climbing stage, magnetic probe diagnostics detects a downward-swept high-frequency MHD instability with a frequency range of is 110~160kHz. The frequency of instability is proportional to the core Alfvén frequency, which lies in the toroidal Alfvén eigenmode (TAE) frequency range. The plasma discharge is terminated as the instability evolves. The study of the high-frequency MHD instability has important reference for the subsequent discharge of HL-3 tokamak and the initial discharge of ITER in future. 

Key words: Plasma, MHD instability, Runaway electrons, Disruptions 

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