After more than ten years of practice, SMBI has been developed to become a useful fuelling method that is already considered to be an improvement over conventional gas puffing （GP）. The HL-2A tokamak is the first tokamak with divertors in China. The main parameters of HL-2A are R = 1.65 m, α=0.4 m, BT=2.8 T and Ip=0.48 MA. The divertor of the machine now is operated with lower single null configuration. Large hydrogen cluster （〉100 atoms） can be produced at low temperature gas.
YAO Lianghua FENG Beibing CHEN Chengyuan SHI Zhongbing YUAN Baoshan XIAO Weiwen ZHOU Yan SUN Hongjuan LU Jie DUAN Xuru PAN Yudong HONG Wenyu LI Wei RAN Hong DING Xuantong LIU Yong
The hydrogen clusters are produced at liquid nitrogen temperature in a supersonic adiabatic expansion of moderate backing pressure gases into vacuum through a Laval nozzle and their averaged size are measured by Rayleigh scattering. The average cluster size N^-c is about 250 hydrogen atoms at a backing pressure 1.0 MPa in these measurements.
YAO LianghuaFENG BeibingCHEN ChengyuanNI GuoquanLU HalyangRAN Hong
