Lithium Pellet Injector Development for NSTX

Gettelfinger, G. ; Dong, J. ; Gernhardt, R. ; Kugel, H. ; Sichta, P. ; Timberlake, J.

Princeton University. Plasma Physics Laboratory.

关键词: Acceleration;    Injection, Pellets;    70 Plasma Physics And Fusion Technology;    Deuterium;    Impurities;   

DOI  :  10.2172/820198
RP-ID  :  PPPL-3902
RP-ID  :  AC02-76CH03073
RP-ID  :  820198

美国|英语

来源: UNT Digital Library

【 摘 要 】

A pellet injector suitable for the injection of lithium and other low-Z pellets of varying mass into plasmas at precise velocities from 5 to 500 m/s is being developed for use on NSTX (National Spherical Torus Experiment). The ability to inject low-Z impurities will significantly expand NSTX experimental capability for a broad range of diagnostic and operational applications. The architecture employs a pellet-carrying cartridge propelled through a guide tube by deuterium gas. Abrupt deceleration of the cartridge at the end of the guide tube results in the pellet continuing along its intended path, thereby giving controlled reproducible velocities for a variety of pellets materials and a reduced gas load to the torus. The planned injector assembly has four hundred guide tubes contained in a rotating magazine with eight tubes provided for injection into plasmas. A PC-based control system is being developed as well and will be described elsewhere in these Proceedings. The development path and mechanical performance of the injector will be described.