Accounting of the Power Balance for Neutral-beam-heated H-Mode Plasmas in NSTX

Paul, S.F. ; Maingi, R. ; Soukhanovskii, V. ; Kaye, S.M. ; Kugel, H. ; Team, the NSTX Research

Princeton University. Plasma Physics Laboratory.

关键词: Plasma-Wall Interaction;    70 Plasma Physics And Fusion Technology;    Shape Divertors;    Impurities;    Energy Balance;   

DOI  :  10.2172/828673
RP-ID  :  PPPL-3992
RP-ID  :  AC02-76CH03073
RP-ID  :  828673

美国|英语

来源: UNT Digital Library

【 摘 要 】

A survey of the dependence of power balance on input power, shape, and plasma current was conducted for neutral-beam-heated plasmas in the National Spherical Torus Experiment (NSTX). Measurements of heat to the divertor strike plates and divertor and core radiation were taken over a wide range of plasma conditions. The different conditions were obtained by inducing a L-mode to H-mode transition, changing the divertor configuration [lower single null (LSN) vs. double-null (DND)] and conducting a NBI power scan in H-mode. 60-70% of the net input power is accounted for in the LSN discharges with 20% of power lost as fast ions, 30-45% incident on the divertor plates, up to 10% radiated in the core, and about 12% radiated in the divertor. In contrast, the power accountability in DND is 85-90%. A comparison of DND and LSN data show that the remaining power in the LSN is likely to be directed to the upper divertor