Experimental study of density pump-out on EAST

• Published in: Plasma science & technology 2017, Vol.19 (1), p.36-43
• Main Author: 王守信 刘海庆 揭银先 臧庆 吕波 张涛 曾龙 张寿彪 史楠 兰婷 邹志勇 李维明 姚远 魏学朝 连辉 李根 徐旵东 张新军 吴斌 孙有文
• Format: Article
• Language: English
• Subjects: EAST; 平均密度; 托卡马克实验装置; 泵; 电子回旋共振加热; 离子回旋共振加热; 等离子体电流; 试验
• ISSN: 1009-0630
• DOI: 10.1088/1009-0630/19/1/015102

In the experimental advanced superconducting tokamak,density pump-out phenomena were observed by using a multi-channel polarimeter-interferometer system under different heating schemes of ion cyclotron resonant heating,electron cyclotron resonance heating,and neutral beam injection.The density pump-out was also induced with application of resonant magnetic perturbation,accompanied with a degradation of particle confinement.For the comparison analysis in all heating schemes,the typical plasma parameters are plasma current 400 k A,toroidal field 2 T,and line average density 2×10^19m^-3.The experimental results show that the degree of pump-out is concerned with electron density and heating power.Low density deuterium low confinement（L-mode） plasmas（〈3.5×10^19m^-3） show strong pump-out effects.The density pump-out correlated with a significant drop of particle confinement.