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Title: EBW-Bootstrap Current Synergy in the National Spherical Torus Experiment (NSTX)

Abstract

Current driven by electron Bernstein waves (EBW) and by the electron bootstrap effect are calculated separately and concurrently with a kinetic code, to determine the degree of synergy between them. A target {beta} = 40% NSTX plasma is examined. A simple bootstrap model in the CQL3D Fokker-Planck code is used in these studies: the transiting electron distributions are connected in velocity-space at the trapped-passing boundary to trapped-electron distributions which are displaced radially by a half-banana width outwards/inwards for the co-/counter-passing regions. This model agrees well with standard bootstrap current calculations, over the outer 60% of the plasma radius. Relatively small synergy net bootstrap current is obtained for EBW power up to 4 MW. Locally, bootstrap current density increases in proportion to increased plasma pressure, and this effect can significantly affect the radial profile of driven current.

Authors:
;
Publication Date:
Research Org.:
Princeton Plasma Physics Lab., Princeton, NJ (US)
Sponsoring Org.:
USDOE Office of Science (SC) (US)
OSTI Identifier:
836632
Report Number(s):
PPPL-4048
TRN: US0500761
DOE Contract Number:  
AC02-76CH03073
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 2 Feb 2005
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BOOTSTRAP CURRENT; BOOTSTRAP MODEL; ELECTRONS; KINETICS; PLASMA; PLASMA PRESSURE; TARGETS; CURRENT DRIVE; TOKAMAKS, NSTX; WAVE INTERACTION, PLASMA

Citation Formats

R.W. Harvey, and G. Taylor. EBW-Bootstrap Current Synergy in the National Spherical Torus Experiment (NSTX). United States: N. p., 2005. Web. doi:10.2172/836632.
R.W. Harvey, & G. Taylor. EBW-Bootstrap Current Synergy in the National Spherical Torus Experiment (NSTX). United States. doi:10.2172/836632.
R.W. Harvey, and G. Taylor. Wed . "EBW-Bootstrap Current Synergy in the National Spherical Torus Experiment (NSTX)". United States. doi:10.2172/836632. https://www.osti.gov/servlets/purl/836632.
@article{osti_836632,
title = {EBW-Bootstrap Current Synergy in the National Spherical Torus Experiment (NSTX)},
author = {R.W. Harvey and G. Taylor},
abstractNote = {Current driven by electron Bernstein waves (EBW) and by the electron bootstrap effect are calculated separately and concurrently with a kinetic code, to determine the degree of synergy between them. A target {beta} = 40% NSTX plasma is examined. A simple bootstrap model in the CQL3D Fokker-Planck code is used in these studies: the transiting electron distributions are connected in velocity-space at the trapped-passing boundary to trapped-electron distributions which are displaced radially by a half-banana width outwards/inwards for the co-/counter-passing regions. This model agrees well with standard bootstrap current calculations, over the outer 60% of the plasma radius. Relatively small synergy net bootstrap current is obtained for EBW power up to 4 MW. Locally, bootstrap current density increases in proportion to increased plasma pressure, and this effect can significantly affect the radial profile of driven current.},
doi = {10.2172/836632},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Feb 02 00:00:00 EST 2005},
month = {Wed Feb 02 00:00:00 EST 2005}
}

Technical Report:

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