| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Investigation of impurity transport using laser blow-off technique in the HL-2A Ohmic and ECRH plasmas |
| 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) |
| Southwestern Institute of Physics, Chengdu 610041, China |
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Abstract 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.
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Received: 25 January 2016
Revised: 23 February 2016
Accepted manuscript online:
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PACS:
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52.25.Vy
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(Impurities in plasmas)
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52.25.Fi
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(Transport properties)
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52.70.Kz
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(Optical (ultraviolet, visible, infrared) measurements)
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| Fund: 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). |
Corresponding Authors:
Kai Zhang
E-mail: zhangkai@swip.ac.cn
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Cite this article:
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 2016 Chin. Phys. B 25 065202
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