Investigation of impurity transport using laser blow-off technique in the HL-2A Ohmic and ECRH plasmas

doi:10.1088/1674-1056/25/6/065202

中国物理B ›› 2016, Vol. 25 ›› Issue (6): 65202-065202.doi: 10.1088/1674-1056/25/6/065202

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

Investigation of impurity transport using laser blow-off technique in the HL-2A Ohmic and ECRH plasmas

Southwestern Institute of Physics, Chengdu 610041, China

收稿日期:2016-01-25 修回日期:2016-02-23 出版日期:2016-06-05 发布日期:2016-06-05
通讯作者: Kai Zhang E-mail:zhangkai@swip.ac.cn
基金资助:
Project partly supported by the National Natural Science Foundation of China (Grant Nos. 11375057 and 11175061) and the Chinese National Magnetic Confinement Fusion Science Program (Grant No. 2014GB108003).

Investigation of impurity transport using laser blow-off technique in the HL-2A Ohmic and ECRH plasmas

Southwestern Institute of Physics, Chengdu 610041, China

Received:2016-01-25 Revised:2016-02-23 Online:2016-06-05 Published:2016-06-05
Contact: Kai Zhang E-mail:zhangkai@swip.ac.cn
Supported by:
Project partly supported by the National Natural Science Foundation of China (Grant Nos. 11375057 and 11175061) and the Chinese National Magnetic Confinement Fusion Science Program (Grant No. 2014GB108003).

摘要/Abstract

摘要：

Impurity transports in two neighboring discharges with and without electron cyclotron resonance heating (ECRH) are studied in the HL-2A tokamak by laser blow-off (LBO) technique. The progression of aluminium ions as the trace impurity is monitored by soft x-ray (SXR) and bolometer detector arrays with good temporal and spatial resolutions. Obvious difference in the time trace of the signal between the Ohmic and ECRH L-mode discharges is observed. Based on the numerical simulation with one-dimensional (1D) impurity transport code STRAHL, the radial profiles of impurity diffusion coefficient D and convective velocity V are obtained for each shot. The result shows that the diffusion coefficient D significantly increases throughout the plasma minor radius for the ECRH case with respect to the Ohmic case, and that the convection velocity V changes from negative (inward) for the Ohmic case to partially positive (outward) for the ECRH case. The result on HL-2A confirms the pump out effect of ECRH on impurity profile as reported on various other devices.

关键词: impurity transport, LBO, numerical simulation, pump out

Abstract:

Key words: impurity transport, LBO, numerical simulation, pump out

中图分类号: (Impurities in plasmas)

52.25.Vy

52.25.Fi (Transport properties) 52.70.Kz (Optical (ultraviolet, visible, infrared) measurements)

张凯, 崔正英, 孙平, 董春凤, 邓玮, 董云波, 宋绍栋, 蒋敏, 李永高, 卢平, 杨青巍. Investigation of impurity transport using laser blow-off technique in the HL-2A Ohmic and ECRH plasmas[J]. 中国物理B, 2016, 25(6): 65202-065202.

Kai Zhang(张凯), Zheng-Ying Cui(崔正英), Ping Sun(孙平), Chun-Feng Dong(董春凤), Wei Deng(邓玮), Yun-Bo Dong(董云波), Shao-Dong Song(宋绍栋), Min Jiang(蒋敏), Yong-Gao Li(李永高), Ping Lu(卢平), Qing-Wei Yang(杨青巍). Investigation of impurity transport using laser blow-off technique in the HL-2A Ohmic and ECRH plasmas[J]. Chin. Phys. B, 2016, 25(6): 65202-065202.

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Investigation of impurity transport using laser blow-off technique in the HL-2A Ohmic and ECRH plasmas

Investigation of impurity transport using laser blow-off technique in the HL-2A Ohmic and ECRH plasmas

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