Investigation of impurity transport using supersonic molecular beam injected neon in HL-2A ECRH plasma

doi:10.1088/1674-1056/22/12/125201

Abstract In this paper, we describe the behavior of impurity transport in the HL-2A electron cyclotron resonance heating (ECRH) L-mode plasma. The neon as a trace impurity is injected by the supersonic molecular beam injection (SMBI) technique, which is used for the first time to study the impurity transport in HL-2A. The progression of neon ions is monitored by the soft X-ray camera and bolometer arrays with good temporal and spatial resolutions. The convection and diffusion process of the neon ions are investigated with the one-dimensional impurity transport code STRAHL. The results show that the diffusion coefficient D of neon ions is a factor of four larger than the neoclassical value in the central region. The value of D is larger in the outer region of the plasma (ρ > 0.6) than in the central region of the plasma (ρ < 0.6). The convective velocity directs inwards with a value of ～-1.0 m/s in the Ohmic discharge, but it reverses to direct outwards with a value of ～ 8.0 m/s in the outer region of the plasma when ECRH is applied. The result indicates that the impurity transport is strongly enhanced with ECRH.

Keywords: impurity transport impurity injection SMBI numerical simulation

Received: 30 April 2013
Revised: 08 June 2013
Accepted manuscript online:

PACS:	52.25.Vy	(Impurities in plasmas)
	52.25.Fi	(Transport properties)
	52.70.Kz	(Optical (ultraviolet, visible, infrared) measurements)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10975048, 11175061, and 10975049).

Corresponding Authors: Cui Xue-Wu
E-mail: cuixw@swip.ac.cn

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Cui Xue-Wu (崔学武), Cui Zheng-Ying (崔正英), Feng Bei-Bin (冯北滨), Pan Yu-Dong (潘宇东), Zhou Hang-Yu (周航宇), Sun Ping (孙平), Fu Bing-Zhong (傅炳忠), Lu Ping (卢平), Dong Yun-Bo (董云波), Gao Jin-Ming (高金明), Song Shao-Dong (宋绍栋), Yang Qing-Wei (杨青巍) Investigation of impurity transport using supersonic molecular beam injected neon in HL-2A ECRH plasma 2013 Chin. Phys. B 22 125201

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Investigation of impurity transport using supersonic molecular beam injected neon in HL-2A ECRH plasma

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