Title :
Fueling Performance of Supersonic Molecular Beam Injection on the J-TEXT Tokamak
Author :
Jinshui Xiao ; Zhoujun Yang ; Zhuang Ge ; Zhifeng Cheng ; Xiande Feng ; Zhijiang Wang ; Minghai Liu
Author_Institution :
State Key of Lab. of Adv. Electromagn. Eng. & Technol., Huazhong Univ. of Sci. & Technol., Wuhan, China
Abstract :
A supersonic molecular beam injection (SMBI) system was developed on the J-TEXT tokamak. With SMBI fueling, a continuous electron density increase was successfully achieved when multiple-pulse injection was employed. A steeper density profile was observed during the penetration process. A high fueling efficiency, between 20% and 45%, was obtained in limiter/ohmic discharges, suggesting that SMBI is a superior fueling method. SMBI efficiency decreased with increasing background electron density. Analyses of the penetration process with a Hα array and a CCD camera suggest the ionization mainly concentrates in the SOL and plasma edge region.
Keywords :
Tokamak devices; discharges (electric); ionisation; plasma beam injection heating; plasma boundary layers; plasma density; plasma diagnostics; plasma toroidal confinement; CCD camera; Hα array; J-TEXT tokamak; SMBI efficiency; SMBI fueling; SOL; continuous electron density; density profile; fueling efficiency; fueling performance; ionization; limiter discharges; multiple-pulse injection; ohmic discharges; penetration process; plasma edge; supersonic molecular beam injection; Arrays; Cameras; Charge coupled devices; Educational institutions; Physics; Tokamaks; Fueling performance; supersonic molecular beam injection (SMBI) system; tokamak;
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2013.2286205
