Accounting of the Power Balance 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 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
- Authors:
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Lab., Princeton, NJ (US)
- Sponsoring Org.:
- USDOE Office of Science (SC) (US)
- OSTI Identifier:
- 828673
- Report Number(s):
- PPPL-3992
TRN: US0404075
- DOE Contract Number:
- AC02-76CH03073
- Resource Type:
- Technical Report
- Resource Relation:
- Other Information: PBD: 9 Aug 2004
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CONFIGURATION; DIVERTORS; ELECTRIC CURRENTS; PLASMA; PLATES; RADIATIONS; SHAPE; ENERGY BALANCE; IMPURITIES; PLASMA-WALL INTERACTION
Citation Formats
Paul, S F, Maingi, R, Soukhanovskii, V, Kaye, S M, Kugel, H, and the NSTX Research Team. Accounting of the Power Balance for Neutral-beam-heated H-Mode Plasmas in NSTX. United States: N. p., 2004.
Web. doi:10.2172/828673.
Paul, S F, Maingi, R, Soukhanovskii, V, Kaye, S M, Kugel, H, & the NSTX Research Team. Accounting of the Power Balance for Neutral-beam-heated H-Mode Plasmas in NSTX. United States. https://doi.org/10.2172/828673
Paul, S F, Maingi, R, Soukhanovskii, V, Kaye, S M, Kugel, H, and the NSTX Research Team. Mon .
"Accounting of the Power Balance for Neutral-beam-heated H-Mode Plasmas in NSTX". United States. https://doi.org/10.2172/828673. https://www.osti.gov/servlets/purl/828673.
@article{osti_828673,
title = {Accounting of the Power Balance for Neutral-beam-heated H-Mode Plasmas in NSTX},
author = {Paul, S F and Maingi, R and Soukhanovskii, V and Kaye, S M and Kugel, H and the NSTX Research Team},
abstractNote = {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},
doi = {10.2172/828673},
url = {https://www.osti.gov/biblio/828673},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2004},
month = {8}
}