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Title: 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

S.F. Paul, R. Maingi, V. Soukhanovskii, S.M. Kaye, H. Kugel, 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.
S.F. Paul, R. Maingi, V. Soukhanovskii, S.M. Kaye, H. Kugel, & the NSTX Research Team. Accounting of the Power Balance for Neutral-beam-heated H-Mode Plasmas in NSTX. United States. doi:10.2172/828673.
S.F. Paul, R. Maingi, V. Soukhanovskii, S.M. Kaye, H. Kugel, and the NSTX Research Team. Mon . "Accounting of the Power Balance for Neutral-beam-heated H-Mode Plasmas in NSTX". United States. doi: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 = {S.F. Paul and R. Maingi and V. Soukhanovskii and S.M. Kaye and H. Kugel 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},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Aug 09 00:00:00 EDT 2004},
month = {Mon Aug 09 00:00:00 EDT 2004}
}

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