Improvement of Plasma Performance with Lithium Wall Conditioning in Aditya Tokamak

查看全文 作　　者：M. B. [1]CHOWDHURI;R. [1]MANCHANDA;J. [1]GHOSH;S. B. [1]BHATT;Ajai [1]KUMAR;B. K. [1]DAS;K. A. [1]JADEJA;P. A. [1]RAIJADA;Manoj [1]KUMAR;S. [1]BANERJEE;Nilam [1]RAMAIYA;Aniruddh [1]MALI;Ketan M. [1]PATEL;Vinay [1]KUMAR;P. [1]VASU;R. [1]BHATTACHARYAY;R. L. [1]TANNA;Y. Shankara [1]JOISA;P. K. [1]ATREY;C. V. S. [1]RAO;D. Chenna [1]REDDY;P. K. [1]CHATTOPADHYAY;R. [1]JHA;Y. C. [1]SAXENA;Aditya [1]team 机构地区：[1]Institute for Plasma Research,Bhat, Gandhinagar 382 428, India 出　　处：《Plasma Science and Technology》索引2013年第15卷第2期,共6页 摘　　要：Lithiumization of the vacuum vessel wall of the Aditya tokamak using a lithium rod exposed to glow discharge cleaning plasma has been done to understand its effect on plasma performance. After the Li-coating, an increment of ~100 eV in plasma electron temperature has been observed in most of the discharges compared to discharges without Li coating, and the shot reproducibility is considerably improved. Detailed studies of impurity behaviour and hydrogen recycling are made in the Li coated discharges by observing spectral lines of hydrogen, carbon, and oxygen in the visible region using optical fiber, an interference filter, and PMT based systems. A large reduction in O I signal (up to ~ 40% to 50%) and a 20% to 30% decrease of H α signal indicate significant reduction of wall recycling. Furthermore, VUV emissions from O V and Fe XV monitored by a grazing incidence monochromator also show the reduction. Lower Fe XV emission indicates the declined impurity penetration to the core plasma in the Li coated discharges. Significant increase of the particle and energy confinement times and the reduction of Z eff of the plasma certainly indicate the improved plasma parameters in the Aditya tokamak after lithium wall conditioning. 关 键 词：托卡马克等离子体 性能改善 壁挂空调 辉光放电清洗 锂 等离子体性能 氢气回收 能量约束时间