›› 2014, Vol. 23 ›› Issue (7): 75206-075206.doi: 10.1088/1674-1056/23/7/075206

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

Toroidicity and shape dependence of peeling mode growth rates in axisymmetric toroidal plasmas

石秉仁   

  1. Southwestern Institute of Physics, Chengdu 610041, China
  • 收稿日期:2013-11-25 修回日期:2014-01-07 出版日期:2014-07-15 发布日期:2014-07-15
  • 基金资助:
    Project supported by the National Magnetic Confinement Fusion Science Program of China (Grant No. 2009GB101002).

Toroidicity and shape dependence of peeling mode growth rates in axisymmetric toroidal plasmas

Shi Bing-Ren (石秉仁)   

  1. Southwestern Institute of Physics, Chengdu 610041, China
  • Received:2013-11-25 Revised:2014-01-07 Online:2014-07-15 Published:2014-07-15
  • Contact: Shi Bing-Ren E-mail:shibr@swip.ac.cn
  • About author:52.55.Fa; 52.55.Rk
  • Supported by:
    Project supported by the National Magnetic Confinement Fusion Science Program of China (Grant No. 2009GB101002).

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摘要： The growth rate of the peeling mode instability with large toroidal mode number is calculated for general axisymmetric toroidal plasmas, including tokamaks and the spherical torus (ST) equilibia by using formalism presented by Connor et al. Analytic equilibia with non-zero edge current density and quasi-uniform current profiles are assumed. It is found that in sharp D-shape tokamak plasma, the derivative of the safety factor with respect to the poloidal flux becomes very large, making the perturbed poloidal motion very large, in turn making a significant reduction of the growth rate of the peeling mode, similar to the X-point effect in diverted plasma. The large aspect ratio effect is also studied, which reduces the growth rate further.

关键词: peeling instability, D-shape and inverse D-shape configurations, todoidicity dependence

Abstract: The growth rate of the peeling mode instability with large toroidal mode number is calculated for general axisymmetric toroidal plasmas, including tokamaks and the spherical torus (ST) equilibia by using formalism presented by Connor et al. Analytic equilibia with non-zero edge current density and quasi-uniform current profiles are assumed. It is found that in sharp D-shape tokamak plasma, the derivative of the safety factor with respect to the poloidal flux becomes very large, making the perturbed poloidal motion very large, in turn making a significant reduction of the growth rate of the peeling mode, similar to the X-point effect in diverted plasma. The large aspect ratio effect is also studied, which reduces the growth rate further.

Key words: peeling instability, D-shape and inverse D-shape configurations, todoidicity dependence

中图分类号:  (Tokamaks, spherical tokamaks)

  • 52.55.Fa
52.55.Rk (Power exhaust; divertors)