Sawtooth Activities During Impurity Injection by Laser Blow-off in HL-2A  

作　　者：邓玮 刘仪 崔正英 董云波 黄渊 张鹏 孙平 傅炳忠 

机构地区：[1]Southwestern Institute of Physics,Chengdu 610041,China

出　　处：《Plasma Science and Technology》2007年第4期411-416,共6页等离子体科学和技术（英文版）

基　　金：supported partially by Sichuan Provincial Youth Foundation for Science and Technology:05ZQ026006;National Natural Science Foundation of China(No.10475022)

摘　　要：In order to study impurity transport and their progression in the plasma, small amount of high-Z impurities were injected into HL-2A ohmic heated plasmas by laser blow-off and traced with good spatial temporal resolution by a soft X-ray camera. An analysis of the evolution of the impurities＇ radiation distribution in the plasma revealed that impurity transport in the central region was profoundly different from that outside of it. It was found that the sawteeth tended to be inverted on the central soft X-ray chord signals after the impurity injection and the soft X- ray profiles exhibited discontinuities during the movement of the impurities in the plasma central region. Detailed 2D visualization of the evolution of impurities＇ radiation using computer tomography has provided further understanding of the properties of impurity transport in the HL-2A plasma.In order to study impurity transport and their progression in the plasma, small amount of high-Z impurities were injected into HL-2A ohmic heated plasmas by laser blow-off and traced with good spatial temporal resolution by a soft X-ray camera. An analysis of the evolution of the impurities＇ radiation distribution in the plasma revealed that impurity transport in the central region was profoundly different from that outside of it. It was found that the sawteeth tended to be inverted on the central soft X-ray chord signals after the impurity injection and the soft X- ray profiles exhibited discontinuities during the movement of the impurities in the plasma central region. Detailed 2D visualization of the evolution of impurities＇ radiation using computer tomography has provided further understanding of the properties of impurity transport in the HL-2A plasma.

关 键 词：impurity injection TOMOGRAPHY sawtooth activity 

分 类 号：O532.26[理学—等离子体物理]