Comparison of Supersonic Molecular Beam Injection from Both Low Field Side and High Field Side of HL-2A

• Published in: Plasma science & technology Vol. 12; no. 5; pp. 529 - 534
• Main Authors: Lianghua, Yao, Dawei, Zhao, Beibin, Feng, Chengyuan, Chen, Yan, Zhou, Xiaoyu, Han, Yonggao, Li, Bucalossi, Jerome, Xuru, Duan
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.10.2010
• Subjects: 喷射系统; 聚变燃料; 超声分子束注入; 超音速
• ISSN: 1009-0630
• DOI: 10.1088/1009-0630/12/5/04

SMBI （supersonic molecular beam injection）, as an effective fueling method for fusion plasmas, has been widely used on the HL-2A tokamak and other fusion devices. Two different types of SMBI system are now installed on HL-2A. One is an electromagnetic valve injector on the low field side （LFS）, and the other is a pneumatic valve injector on the high field side （HFS）. A new electron density record nc = 4.7× 10^19 m ^-3 which exceeds both the Oreenwald density limit and the maximum density obtained by gas puffing （GP）, was obtained on HL-2A with single-null-divertor operation. The HFS injection system is still under test, however, its outstanding fueling characteristics have already been observed, e.g. it has higher fueling efficiency compared to the LFS system. This excellent feature is still preserved during the process of ECRH.