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
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)
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)
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.
中图分类号: (Impurities in plasmas)