Effects of q-profiles of a weak magnetic shear on energetic ion excited q=1 mode in tokamak plasmas

doi:10.1088/1674-1056/25/1/015203

Abstract In this paper, we study the effect of safety factor profiles, particularly with a very weak magnetic shear, on the m/n=1 mode excited by energetic ions in tokamak plasmas. It is found that the profile plays a significant role in the onset of the mode, and the thresholds for the instability are also derived. The numerical results for configurations with conventional or reversed non monotonic magnetic shears are discussed. The effects of radial location of rational surfaces, edge q value, and flatness of q-profile on the energetic ion excited mode are further analyzed in detail.

Keywords: safety factor profile magnetohydrodynamics tokamak energetic particles

Received: 24 July 2015
Revised: 01 September 2015
Accepted manuscript online:

PACS:	52.55.Fa	(Tokamaks, spherical tokamaks)
	52.30.Cv	(Magnetohydrodynamics (including electron magnetohydrodynamics))
	89.30.Jj	(Nuclear fusion power)

Fund: Project supported by the National Magnetic Confinement Fusion Science Program of China (Grant No. 2014GB107004) and the National Natural Science Foundation of China (Grant Nos. 11575014, 11375053, 11475058, and 11261140326).

Corresponding Authors: Xian-Qu Wang
E-mail: xianquwang@swjtu.edu.cn

Cite this article:

Ze-Yu Li(李泽宇), Xian-Qu Wang(王先驱), Xiao-Gang Wang(王晓钢) Effects of q-profiles of a weak magnetic shear on energetic ion excited q=1 mode in tokamak plasmas 2016 Chin. Phys. B 25 015203

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Effects of q-profiles of a weak magnetic shear on energetic ion excited q=1 mode in tokamak plasmas

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