中国物理B ›› 2021, Vol. 30 ›› Issue (5): 55206-055206.doi: 10.1088/1674-1056/abd758

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Observation of trapped and passing runaway electrons by infrared camera in the EAST tokamak

Yong-Kuan Zhang(张永宽)1,2, Rui-Jie Zhou(周瑞杰)1, Li-Qun Hu(胡立群)1,†, Mei-Wen Chen(陈美文)1,2, Yan Chao(晁燕)1,2, Jia-Yuan Zhang(张家源)1,2, and Pan Li(李磐)1,2   

  1. 1 Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China;
    2 University of Science and Technology of China, Hefei 230026, China
  • 收稿日期:2020-10-09 修回日期:2020-12-17 接受日期:2020-12-30 出版日期:2021-05-14 发布日期:2021-05-14
  • 通讯作者: Li-Qun Hu E-mail:lqhu@ipp.ac.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 11775263) and the National Magnetic Confinement Fusion Energy Research Project of China (Grant No. 2015GB111003).

Observation of trapped and passing runaway electrons by infrared camera in the EAST tokamak

Yong-Kuan Zhang(张永宽)1,2, Rui-Jie Zhou(周瑞杰)1, Li-Qun Hu(胡立群)1,†, Mei-Wen Chen(陈美文)1,2, Yan Chao(晁燕)1,2, Jia-Yuan Zhang(张家源)1,2, and Pan Li(李磐)1,2   

  1. 1 Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China;
    2 University of Science and Technology of China, Hefei 230026, China
  • Received:2020-10-09 Revised:2020-12-17 Accepted:2020-12-30 Online:2021-05-14 Published:2021-05-14
  • Contact: Li-Qun Hu E-mail:lqhu@ipp.ac.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 11775263) and the National Magnetic Confinement Fusion Energy Research Project of China (Grant No. 2015GB111003).

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摘要： In EAST, synchrotron radiation is emitted by runaway electrons in the infrared band, which can be observed by infrared cameras. This synchrotron radiation is mainly emitted by passing runaway electrons with tens of MeV energy. A common feature of radiation dominated by passing runaway electrons is that it is strongest on the high field side. However, the deeply trapped runaway electrons cannot reach the high field side in principle. Therefore, in this case, the high field side radiation is expected to be weak. This paper reports for the first time that the synchrotron radiation from trapped runaway electrons dominates that from passing runaway electrons and is identifiable in an image. Although the synchrotron radiation dominated by trapped runaway electrons can be observed in experiment, the proportion of trapped runaway electrons is very low.

关键词: tokamak, trapped runaway electron, synchrotron radiation

Abstract: In EAST, synchrotron radiation is emitted by runaway electrons in the infrared band, which can be observed by infrared cameras. This synchrotron radiation is mainly emitted by passing runaway electrons with tens of MeV energy. A common feature of radiation dominated by passing runaway electrons is that it is strongest on the high field side. However, the deeply trapped runaway electrons cannot reach the high field side in principle. Therefore, in this case, the high field side radiation is expected to be weak. This paper reports for the first time that the synchrotron radiation from trapped runaway electrons dominates that from passing runaway electrons and is identifiable in an image. Although the synchrotron radiation dominated by trapped runaway electrons can be observed in experiment, the proportion of trapped runaway electrons is very low.

Key words: tokamak, trapped runaway electron, synchrotron radiation

中图分类号:  (Particle measurements)

  • 52.70.Nc
52.25.Os (Emission, absorption, and scattering of electromagnetic radiation ?) 52.35.Hr (Electromagnetic waves (e.g., electron-cyclotron, Whistler, Bernstein, upper hybrid, lower hybrid))