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

doi:10.1088/1674-1056/23/7/075206

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.

Keywords: peeling instability D-shape and inverse D-shape configurations todoidicity dependence

Received: 25 November 2013
Revised: 07 January 2014
Accepted manuscript online:

PACS:	52.55.Fa	(Tokamaks, spherical tokamaks)
	52.55.Rk	(Power exhaust; divertors)

Fund: Project supported by the National Magnetic Confinement Fusion Science Program of China (Grant No. 2009GB101002).

Corresponding Authors: Shi Bing-Ren
E-mail: shibr@swip.ac.cn

About author: 52.55.Fa; 52.55.Rk

Cite this article:

Shi Bing-Ren (石秉仁) Toroidicity and shape dependence of peeling mode growth rates in axisymmetric toroidal plasmas 2014 Chin. Phys. B 23 075206

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

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