Power balance accounting for neutral-beam heated H-mode plasmas in NSTX
Abstract
A survey of the dependence of power balance on input power, shape, and plasma current was conducted neutral beam heated plasmas in NSTX. Measurements of heat to the divertor strike plates and divertor and core radiation were taken over a wide range of plasma conditions, including a L-mode to H-mode transition, lower single null (LSN) and double-null (DND) configurations, and conducting a NBI power scan in H-mode plasmas. 60-70% of the net input power is accounted 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.
- Publication:
-
APS Division of Plasma Physics Meeting Abstracts
- Pub Date:
- November 2004
- Bibcode:
- 2004APS..DPPJP1010P