中国物理B ›› 2016, Vol. 25 ›› Issue (10): 106601-106601.doi: 10.1088/1674-1056/25/10/106601

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Radial transport dynamics studies of SMBI with a newly developed TPSMBI code

Ya-Hui Wang(王亚辉), Wen-Feng Guo(郭文峰), Zhan-Hui Wang(王占辉), Qi-Long Ren(任启龙), Ai-Ping Sun(孙爱萍), Min Xu(许敏), Ai-Ke Wang(王爱科), Nong Xiang(项农)   

  1. 1 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;
    2 University of Science and Technology of China, Hefei 230026, China;
    3 Center for Magnetic Fusion Theory, Chinese Academy of Sciences, Hefei 230031, China;
    4 Southwestern Institute of Physics, Chengdu 610041, China
  • 收稿日期:2016-04-15 修回日期:2016-05-22 出版日期:2016-10-05 发布日期:2016-10-05
  • 通讯作者: Wen-Feng Guo, Zhan-Hui Wang E-mail:wfguo@ipp.ac.cn;zhwang@swip.ac.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11575055, 11375053, and 11475219) and the National Magnetic Confinement Fusion Science Program of China (Grant Nos. 2013GB111005, 2014GB108004, and 2015GB110001).

Radial transport dynamics studies of SMBI with a newly developed TPSMBI code

Ya-Hui Wang(王亚辉)1,2,3, Wen-Feng Guo(郭文峰)1,3, Zhan-Hui Wang(王占辉)4, Qi-Long Ren(任启龙)1, Ai-Ping Sun(孙爱萍)4, Min Xu(许敏)4, Ai-Ke Wang(王爱科)4, Nong Xiang(项农)1,3   

  1. 1 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;
    2 University of Science and Technology of China, Hefei 230026, China;
    3 Center for Magnetic Fusion Theory, Chinese Academy of Sciences, Hefei 230031, China;
    4 Southwestern Institute of Physics, Chengdu 610041, China
  • Received:2016-04-15 Revised:2016-05-22 Online:2016-10-05 Published:2016-10-05
  • Contact: Wen-Feng Guo, Zhan-Hui Wang E-mail:wfguo@ipp.ac.cn;zhwang@swip.ac.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11575055, 11375053, and 11475219) and the National Magnetic Confinement Fusion Science Program of China (Grant Nos. 2013GB111005, 2014GB108004, and 2015GB110001).

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摘要： In tokamak plasma fueling, supersonic molecule beam injection (SMBI) with a higher fueling efficiency and a deeper penetration depth than the traditional gas puffing method has been developed and widely applied to many tokamak devices. It is crucial to study the transport dynamics of SMBI to improve its fueling efficiency, especially in the high confinement regime. A new one-dimensional (1D) code of TPSMBI has also been developed recently based on a six-field SMBI model in cylindrical coordinate. It couples plasma density and heat radial transport equations together with neutral density transport equations for both molecules and atoms and momentum radial transport equations for molecules. The dominant particle collisional interactions between plasmas and neutrals, such as molecule dissociation, atom ionization and charge-exchange effects, are included in the model. The code is verified to be correct with analytical solutions and also benchmarked well with the trans-neut module of BOUT++ code. Time-dependent radial transport dynamics and mean profile evolution are studied during SMBI with the TPSMBI code in both slab and cylindrical coordinates. Along the SMBI path, plasma density increases due to particle fuelling, while plasma temperature decreases due to heat cooling. Being different from slab coordinate, the curvature effect leads to larger front densities of molecule and atom during SMBI in cylindrical coordinate simulation.

关键词: transport, plasma physics, SMBI simulation, TPSMBI

Abstract: In tokamak plasma fueling, supersonic molecule beam injection (SMBI) with a higher fueling efficiency and a deeper penetration depth than the traditional gas puffing method has been developed and widely applied to many tokamak devices. It is crucial to study the transport dynamics of SMBI to improve its fueling efficiency, especially in the high confinement regime. A new one-dimensional (1D) code of TPSMBI has also been developed recently based on a six-field SMBI model in cylindrical coordinate. It couples plasma density and heat radial transport equations together with neutral density transport equations for both molecules and atoms and momentum radial transport equations for molecules. The dominant particle collisional interactions between plasmas and neutrals, such as molecule dissociation, atom ionization and charge-exchange effects, are included in the model. The code is verified to be correct with analytical solutions and also benchmarked well with the trans-neut module of BOUT++ code. Time-dependent radial transport dynamics and mean profile evolution are studied during SMBI with the TPSMBI code in both slab and cylindrical coordinates. Along the SMBI path, plasma density increases due to particle fuelling, while plasma temperature decreases due to heat cooling. Being different from slab coordinate, the curvature effect leads to larger front densities of molecule and atom during SMBI in cylindrical coordinate simulation.

Key words: transport, plasma physics, SMBI simulation, TPSMBI

中图分类号:  (Thermal diffusion and diffusive energy transport)

  • 66.10.cd
52.25.Ya (Neutrals in plasmas) 52.65.-y (Plasma simulation) 02.60.Cb (Numerical simulation; solution of equations)