中国物理B ›› 2019, Vol. 28 ›› Issue (4): 45202-045202.doi: 10.1088/1674-1056/28/4/045202

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇    下一篇

Effect of edge transport barrier on required toroidal field for ignition of elongated tokamak

Cui-Kun Yang(杨翠坤), Ming-Sheng Chu(朱名盛), Wen-Feng Guo(郭文峰)   

  1. 1 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;
    2 University of Science and Technology of China, Hefei 230031, China
  • 收稿日期:2018-12-16 修回日期:2019-02-18 出版日期:2019-04-05 发布日期:2019-04-05
  • 通讯作者: Cui-Kun Yang E-mail:ckyang@ipp.ac.cn
  • 基金资助:

    Project supported by the National Key Research and Development Program of China (Grant No. 2017YFE0300402), the National Natural Science Foundation of China (Grant Nos. 11475219 and 11775268), and the Major/Innovative Program of Development Foundation of Hefei Center for Physical Science and Technology, China (Grant No. 2018CXFX009).

Effect of edge transport barrier on required toroidal field for ignition of elongated tokamak

Cui-Kun Yang(杨翠坤)1,2, Ming-Sheng Chu(朱名盛)1, Wen-Feng Guo(郭文峰)1   

  1. 1 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;
    2 University of Science and Technology of China, Hefei 230031, China
  • Received:2018-12-16 Revised:2019-02-18 Online:2019-04-05 Published:2019-04-05
  • Contact: Cui-Kun Yang E-mail:ckyang@ipp.ac.cn
  • Supported by:

    Project supported by the National Key Research and Development Program of China (Grant No. 2017YFE0300402), the National Natural Science Foundation of China (Grant Nos. 11475219 and 11775268), and the Major/Innovative Program of Development Foundation of Hefei Center for Physical Science and Technology, China (Grant No. 2018CXFX009).

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摘要：

The effect of an edge transport barrier on the toroidal field required for the ignition of an elongated tokamak is studied by modifying an analytic model which was calibrated against a transport code. It is found that the presence of the edge transport barrier will lead to a higher marginal toroidal field needed for ignition. This seemingly counter intuitive result is explained as being due to the equivalent effect of profile broadening by the edge transport barrier. This effect is further traced to its physical origin:in the case close to ignition, the fusion power input is predominantly concentrated in the center of plasma. It is demonstrated that if the fusion power input could be shifted from the center to the edge by a sufficient amount, then the presence of an edge transport barrier would lead to a reduction of the required toroidal field for ignition.

关键词: edge transport barrier, toroidal field, ignition, tokamak

Abstract:

The effect of an edge transport barrier on the toroidal field required for the ignition of an elongated tokamak is studied by modifying an analytic model which was calibrated against a transport code. It is found that the presence of the edge transport barrier will lead to a higher marginal toroidal field needed for ignition. This seemingly counter intuitive result is explained as being due to the equivalent effect of profile broadening by the edge transport barrier. This effect is further traced to its physical origin:in the case close to ignition, the fusion power input is predominantly concentrated in the center of plasma. It is demonstrated that if the fusion power input could be shifted from the center to the edge by a sufficient amount, then the presence of an edge transport barrier would lead to a reduction of the required toroidal field for ignition.

Key words: edge transport barrier, toroidal field, ignition, tokamak

中图分类号:  (Plasma heating by DC fields; ohmic heating, arcs)

  • 52.50.Nr
52.55.Fa (Tokamaks, spherical tokamaks) 52.55.Dy (General theory and basic studies of plasma lifetime, particle and heat loss, energy balance, field structure, etc.)