中国物理B ›› 2022, Vol. 31 ›› Issue (12): 125203-125203.doi: 10.1088/1674-1056/ac7f93

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Upgrade of the magnetic diagnostic system for restart of HT-6M operation

Li-Xing Chen(陈力行)1,2, Biao Shen(沈飊)1, Da-Long Chen(陈大龙)1,†, Zheng-Ping Luo(罗正平)1,‡, Zu-Chao Zhang(张祖超)1, Ying Chen(陈颖)1, Yong Wang(王勇)1, and Jin-Ping Qian(钱金平)1   

  1. 1 Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230026, China;
    2 University of Science and Technology of China, Hefei 230026, China
  • 收稿日期:2022-05-30 修回日期:2022-07-04 接受日期:2022-07-08 出版日期:2022-11-11 发布日期:2022-11-11
  • 通讯作者: Da-Long Chen, Zheng-Ping Luo E-mail:cdalong@ipp.ac.cn;zhpluo@ipp.ac.cn
  • 基金资助:
    Project supported by the National MCF Energy Research and Development Program of China (Grant Nos. 2018YFE0302100 and 2018YFE0301105), the National Natural Science Foundation of China (Grant No. 11875291), and the Comprehensive Research Facility for Fusion Technology Program of China (Grant No. 2018-000052-73-01-001228).

Upgrade of the magnetic diagnostic system for restart of HT-6M operation

Li-Xing Chen(陈力行)1,2, Biao Shen(沈飊)1, Da-Long Chen(陈大龙)1,†, Zheng-Ping Luo(罗正平)1,‡, Zu-Chao Zhang(张祖超)1, Ying Chen(陈颖)1, Yong Wang(王勇)1, and Jin-Ping Qian(钱金平)1   

  1. 1 Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230026, China;
    2 University of Science and Technology of China, Hefei 230026, China
  • Received:2022-05-30 Revised:2022-07-04 Accepted:2022-07-08 Online:2022-11-11 Published:2022-11-11
  • Contact: Da-Long Chen, Zheng-Ping Luo E-mail:cdalong@ipp.ac.cn;zhpluo@ipp.ac.cn
  • Supported by:
    Project supported by the National MCF Energy Research and Development Program of China (Grant Nos. 2018YFE0302100 and 2018YFE0301105), the National Natural Science Foundation of China (Grant No. 11875291), and the Comprehensive Research Facility for Fusion Technology Program of China (Grant No. 2018-000052-73-01-001228).

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摘要： The HT-6M tokamak at the Thailand Institute of Nuclear Technology has been restarted. In order to ensure the smooth breakdown of plasma and obtain plasma discharge parameters, optimization of the poloidal field coils and upgrade of the magnetic diagnostics are described in this article. A perfect null field (stray field in the main chamber < 10 G) is obtained using an ohmic heating field. To obtain important information about the plasma, an external magnetic diagnostics system is designed and calibrated, including a Rogowski coil (measuring plasma current), a magnetic probe (measuring external field), diamagnetic loops (measuring βp) and so on. In order to realize high-frequency signal measurement and transmission, a series of frequency responses with the magnetic probe and transmission line are tested. Later, to verify the null field, a fitting code is developed to reconstruct the stray field in the vacuum chamber based on magnetic probe measurements and flux loops. The results show that the error is within 1.5%. This indicates the accuracy of the magnetic measurement system and ensures the preparation for the breakdown of plasma.

关键词: HT-6M, null field, magnetic measurement, high frequency calibration

Abstract: The HT-6M tokamak at the Thailand Institute of Nuclear Technology has been restarted. In order to ensure the smooth breakdown of plasma and obtain plasma discharge parameters, optimization of the poloidal field coils and upgrade of the magnetic diagnostics are described in this article. A perfect null field (stray field in the main chamber < 10 G) is obtained using an ohmic heating field. To obtain important information about the plasma, an external magnetic diagnostics system is designed and calibrated, including a Rogowski coil (measuring plasma current), a magnetic probe (measuring external field), diamagnetic loops (measuring βp) and so on. In order to realize high-frequency signal measurement and transmission, a series of frequency responses with the magnetic probe and transmission line are tested. Later, to verify the null field, a fitting code is developed to reconstruct the stray field in the vacuum chamber based on magnetic probe measurements and flux loops. The results show that the error is within 1.5%. This indicates the accuracy of the magnetic measurement system and ensures the preparation for the breakdown of plasma.

Key words: HT-6M, null field, magnetic measurement, high frequency calibration

中图分类号:  (Tokamaks, spherical tokamaks)

  • 52.55.Fa
52.70.Ds (Electric and magnetic measurements) 52.80.Pi (High-frequency and RF discharges)