Local scrape-off layer control using biased electrodes in NSTX

Zweben, S. J. ; Maqueda, R. J. ; Roquemore, A. L. ; Bush, C. E. ; Kaita, R. ; Marsala, R. J. ; Raitses, Y. ; Cohen, R. H. ; Ryutov, D. D.

Princeton University. Plasma Physics Laboratory.

关键词: Sols Scrape-Off Layer (Sol), Tokamaks, Nstx;    Electrodes;    70 Plasma Physics And Fusion Technology;    Scrape-Off Layer (Sol), Tokamaks, Nstx;    Langmuir Probe;   

RP-ID  :  PPPL-4404
RP-ID  :  DE-ACO2-09CH11466
RP-ID  :  953210

美国|英语

来源: UNT Digital Library

【 摘 要 】

An experiment was designed to test the theory that biased electrodes can affect the local scrape-off layer (SOL) width by creating a strong radial ExB drift [Cohen, R.H. and Ryutov, D.D, Nucl. Fusion 37, 621 (1997)]. These electrodes were located near the outer midplane in the SOL of the National Spherical Torus Experiment (NSTX). The electrodes were biased at up to �100 Volts, and the radial profile of the plasma between them was measured by an array of Langmuir probes. The biasing caused large changes in the local SOL profiles at least qualitatively consistent with this theory.