中国物理B ›› 2011, Vol. 20 ›› Issue (9): 95201-095201.doi: 10.1088/1674-1056/20/9/095201

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Numerical analysis of high Mach flow and flow reversal in the experimental advanced superconducting tokamak divertor

欧靖, 杨锦宏   

  1. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
  • 收稿日期:2011-02-23 修回日期:2011-04-08 出版日期:2011-09-15 发布日期:2011-09-15

Numerical analysis of high Mach flow and flow reversal in the experimental advanced superconducting tokamak divertor

Ou Jing(欧靖)a)b)† and Yang Jin-Hong(杨锦宏)a)   

  1. a Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China; b Center for Magnetic Fusion Theory, Chinese Academy of Sciences, Hefei 230031, China
  • Received:2011-02-23 Revised:2011-04-08 Online:2011-09-15 Published:2011-09-15

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摘要： The B2-Eirene (SOLPS 4.0) code package is used to investigate the plasma parallel flow, i.e., the scrape-off layer (SOL) flow, in the experimental advanced superconducting tokamak (EAST) divertor. Simulation results show that the SOL flow in the divertor region can exhibit complex behaviour, such as a high Mach flow and flow reversal in different plasma regimes. When the divertor plasma is in the detachment state, the high Mach flow with approaching or exceeding sonic speed is observed away from the target plate in our simulation. When the divertor plasma is in the high recycling state, the flow reversal with a small Mach number (|M|< 0.2) is observed near the X-point along the separatrix region. The driving mechanisms for the high Mach flow and the reversed flow are analysed theoretically through momentum and continuity equations, respectively. The profile of the ionization sources is shown to be a possible formation condition causing the complex behaviour of the SOL flow. In addition, the effects of the high Mach flow and the flow reversal on the impurity transport are also discussed in this paper.

关键词: high Mach flow, flow reversal, ionization source, divertor plasma

Abstract: The B2-Eirene (SOLPS 4.0) code package is used to investigate the plasma parallel flow, i.e., the scrape-off layer (SOL) flow, in the experimental advanced superconducting tokamak (EAST) divertor. Simulation results show that the SOL flow in the divertor region can exhibit complex behaviour, such as a high Mach flow and flow reversal in different plasma regimes. When the divertor plasma is in the detachment state, the high Mach flow with approaching or exceeding sonic speed is observed away from the target plate in our simulation. When the divertor plasma is in the high recycling state, the flow reversal with a small Mach number (|M|< 0.2) is observed near the X-point along the separatrix region. The driving mechanisms for the high Mach flow and the reversed flow are analysed theoretically through momentum and continuity equations, respectively. The profile of the ionization sources is shown to be a possible formation condition causing the complex behaviour of the SOL flow. In addition, the effects of the high Mach flow and the flow reversal on the impurity transport are also discussed in this paper.

Key words: high Mach flow, flow reversal, ionization source, divertor plasma

中图分类号:  (Transport properties)

  • 52.25.Fi
52.30.-q (Plasma dynamics and flow) 52.30.Ex (Two-fluid and multi-fluid plasmas)