Effect of Equilibrium Current Profiles on External Kink Modes in Tokamaks

LIU Chao(刘超); LIU Yue(刘悦); MA Zhaoshuai(马照帅)

doi:10.1088/1009-0630/16/8/02

Plasma Science and Technology > 2014 > 16(8): 726-731. > DOI: 10.1088/1009-0630/16/8/02

LIU Chao(刘超), LIU Yue(刘悦), MA Zhaoshuai(马照帅). Effect of Equilibrium Current Profiles on External Kink Modes in Tokamaks[J]. Plasma Science and Technology, 2014, 16(8): 726-731. DOI: 10.1088/1009-0630/16/8/02

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Effect of Equilibrium Current Profiles on External Kink Modes in Tokamaks

Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Dalian University of Technology), Ministry of Education, Dalian 116024, China

Funds: supported by National Natural Science Foundation of China (Nos. 11275041 and 11105065)

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Received Date: August 06, 2013

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Abstract

Abstract

Based on a linearized MHD model, the effect of equilibrium current profiles on external kink modes in tokamaks is studied by MARS code. Three types of equilibrium current profiles are adopted in this work. Firstly, a set of parabolic equilibrium current profiles are chosen. In these profiles the maximum current values in the center of the plasma are fixed, and the currents have different gradient and jump at the plasma boundary. The effects of the current gradient and jump on the growth rate of external kink mode are investigated. It is found that the current jump which causes the q profiles to change plays an important role in the external kink modes in tokamaks. Secondly, a set of step equilibrium current profiles with different jump positions are chosen. The effect of jump position on external kink modes is discussed. Thirdly, a set of parabolic equilibrium current profiles with current bumps are chosen for the case of off-axis heating. The effects of height, width and position of the current bumps on external kink modes are analyzed. The flat equilibrium current profiles are disadvantageous for the MHD stabilities of tokamaks, because of the large current jump at the plasma edge. The peaked equilibrium current profiles and a large and localized current bump near the plasma edge benefit the MHD stabilities of tokamaks.
- external kink mode,
- equilibrium current profile,
- tokamaks

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References (11)

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