Local Effects of Biased Electrodes in the Divertor of NSTX

: S. Zweben, M.D. Campanell, B.C. Lyons, R.J. Maqueda, Y. Raitses, A.L. Roquemore and F. Scotti

Princeton University. Plasma Physics Laboratory.

关键词: 70 Plasma Physics And Fusion Technology;   

RP-ID  :  PPPL-4760
RP-ID  :  DE-ACO2-09CH11466
RP-ID  :  1062655

美国|英语

来源: UNT Digital Library

【 摘 要 】

The goal of this paper is to characterize the effects of small non-axisymmetric divertor plate electrodes on the local scrape-off layer plasma. Four small rectangular electrodes were installed into the outer divertor plates of NSTX. When the electrodes were located near the outer divertor strike point and biased positively, there was an increase in the nearby probe currents and probe potentials and an increase in the LiI light emission at the large major radius end of these electrodes. When an electrode located farther outward from the outer divertor strike point was biased positively, there was sometimes a significant decrease in the LiI light emission at the small major radius end of this electrode, but there were no clear effects on the nearby probes. No non-local effects were observed with the biasing of these electrodes.