skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Calculations of Neutral Beam Ion Confinement for the National Spherical Torus Experiment

Abstract

The spherical torus (ST) concept underlies several contemporary plasma physics experiments, in which relatively low magnetic fields, high plasma edge q, and low aspect ratio combine for potentially compact, high beta and high performance fusion reactors. An important issue for the ST is the calculation of energetic ion confinement, as large Larmor radius makes conventional guiding center codes of limited usefulness and efficient plasma heating by RF and neutral beam ion technology requires minimal fast ion losses. The National Spherical Torus Experiment (NSTX) is a medium-sized, low aspect ratio ST, with R=0.85 m, a=0.67 m, R/a=1.26, Ip*1.4 MA, Bt*0.6 T, 5 MW of neutral beam heating and 6 MW of RF heating. 80 keV neutral beam ions at tangency radii of 0.5, 0.6 and 0.7 m are routinely used to achieve plasma betas above 30%. Transport analyses for experiments on NSTX often exhibit a puzzling ion power balance. It will be necessary to have reliable beam ion calculations to distinguish among the source and loss channels, and to explore the possibilities for new physics phenomena, such as the recently proposed compressional Alfven eigenmode ion heating.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Princeton Plasma Physics Lab., NJ (US)
Sponsoring Org.:
USDOE Office of Science (US)
OSTI Identifier:
803990
Report Number(s):
PPPL-3714
TRN: US0300568
DOE Contract Number:  
AC02-76CH03073
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 27 Jun 2002
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ASPECT RATIO; CONFINEMENT; HEATING; LARMOR RADIUS; MAGNETIC FIELDS; PERFORMANCE; PHYSICS; PLASMA; PLASMA HEATING; THERMONUCLEAR REACTORS; TRANSPORT

Citation Formats

M.H. Redi, D.S. Darrow, J. Egedal, S.M. Kaye, and R.B. White. Calculations of Neutral Beam Ion Confinement for the National Spherical Torus Experiment. United States: N. p., 2002. Web. doi:10.2172/803990.
M.H. Redi, D.S. Darrow, J. Egedal, S.M. Kaye, & R.B. White. Calculations of Neutral Beam Ion Confinement for the National Spherical Torus Experiment. United States. doi:10.2172/803990.
M.H. Redi, D.S. Darrow, J. Egedal, S.M. Kaye, and R.B. White. Thu . "Calculations of Neutral Beam Ion Confinement for the National Spherical Torus Experiment". United States. doi:10.2172/803990. https://www.osti.gov/servlets/purl/803990.
@article{osti_803990,
title = {Calculations of Neutral Beam Ion Confinement for the National Spherical Torus Experiment},
author = {M.H. Redi and D.S. Darrow and J. Egedal and S.M. Kaye and R.B. White},
abstractNote = {The spherical torus (ST) concept underlies several contemporary plasma physics experiments, in which relatively low magnetic fields, high plasma edge q, and low aspect ratio combine for potentially compact, high beta and high performance fusion reactors. An important issue for the ST is the calculation of energetic ion confinement, as large Larmor radius makes conventional guiding center codes of limited usefulness and efficient plasma heating by RF and neutral beam ion technology requires minimal fast ion losses. The National Spherical Torus Experiment (NSTX) is a medium-sized, low aspect ratio ST, with R=0.85 m, a=0.67 m, R/a=1.26, Ip*1.4 MA, Bt*0.6 T, 5 MW of neutral beam heating and 6 MW of RF heating. 80 keV neutral beam ions at tangency radii of 0.5, 0.6 and 0.7 m are routinely used to achieve plasma betas above 30%. Transport analyses for experiments on NSTX often exhibit a puzzling ion power balance. It will be necessary to have reliable beam ion calculations to distinguish among the source and loss channels, and to explore the possibilities for new physics phenomena, such as the recently proposed compressional Alfven eigenmode ion heating.},
doi = {10.2172/803990},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {6}
}