Accounting of the Power Balance for Neutral-beam Heated H-mode Plasmas in NSTX.

Paul, S. F. ; Maingi, R.

Technical Information Center Oak Ridge Tennessee

关键词: Plasma heating;    Tokamak devices;    Configuration;    Divertors;    Electric currents;   

RP-ID  :  DE2004828673

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports 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%.