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Title: Electron Bernstein Wave Research on NSTX and CDX-U

Abstract

Studies of thermally emitted electron Bernstein waves (EBWs) on CDX-U and NSTX, via mode conversion (MC) to electromagnetic radiation, support the use of EBWs to measure the Te profile and provide local electron heating and current drive (CD) in overdense spherical torus plasmas. An X-mode antenna with radially adjustable limiters successfully controlled EBW MC on CDX-U and enhanced MC efficiency to {approx} 100%. So far the X-mode MC efficiency on NSTX has been increased by a similar technique to 40-50% and future experiments are focused on achieving * 80% MC. MC efficiencies on both machines agree well with theoretical predictions. Ray tracing and Fokker-Planck modeling for NSTX equilibria are being conducted to support the design of a 3 MW, 15 GHz EBW heating and CD system for NSTX to assist non-inductive plasma startup, current ramp up, and to provide local electron heating and CD in high beta NSTX plasmas.

Authors:
; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Princeton Plasma Physics Lab., NJ (US)
Sponsoring Org.:
USDOE Office of Science (SC) (US)
OSTI Identifier:
814023
Report Number(s):
PPPL-3820
TRN: US0303978
DOE Contract Number:  
AC02-76CH03073
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 10 Jun 2003
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ANTENNAS; DESIGN; EFFICIENCY; ELECTROMAGNETIC RADIATION; ELECTRONS; HEATING; MODE CONVERSION; PLASMA; SIMULATION; CYCLOTRON RESONANCE; HEATING, ECRH; SPHERICAL TORUS

Citation Formats

G. Taylor, P.C. Efthimion, B. Jones, G.L. Bell, A. Bers, T.S. Bigelow, M.D. Carter, R.W. Harvey, A.K. Ram, D.A. Rasmussen, A.P. Smirnov, J.B. Wilgen, and J.R. Wilson. Electron Bernstein Wave Research on NSTX and CDX-U. United States: N. p., 2003. Web. doi:10.2172/814023.
G. Taylor, P.C. Efthimion, B. Jones, G.L. Bell, A. Bers, T.S. Bigelow, M.D. Carter, R.W. Harvey, A.K. Ram, D.A. Rasmussen, A.P. Smirnov, J.B. Wilgen, & J.R. Wilson. Electron Bernstein Wave Research on NSTX and CDX-U. United States. doi:10.2172/814023.
G. Taylor, P.C. Efthimion, B. Jones, G.L. Bell, A. Bers, T.S. Bigelow, M.D. Carter, R.W. Harvey, A.K. Ram, D.A. Rasmussen, A.P. Smirnov, J.B. Wilgen, and J.R. Wilson. Tue . "Electron Bernstein Wave Research on NSTX and CDX-U". United States. doi:10.2172/814023. https://www.osti.gov/servlets/purl/814023.
@article{osti_814023,
title = {Electron Bernstein Wave Research on NSTX and CDX-U},
author = {G. Taylor and P.C. Efthimion and B. Jones and G.L. Bell and A. Bers and T.S. Bigelow and M.D. Carter and R.W. Harvey and A.K. Ram and D.A. Rasmussen and A.P. Smirnov and J.B. Wilgen and J.R. Wilson},
abstractNote = {Studies of thermally emitted electron Bernstein waves (EBWs) on CDX-U and NSTX, via mode conversion (MC) to electromagnetic radiation, support the use of EBWs to measure the Te profile and provide local electron heating and current drive (CD) in overdense spherical torus plasmas. An X-mode antenna with radially adjustable limiters successfully controlled EBW MC on CDX-U and enhanced MC efficiency to {approx} 100%. So far the X-mode MC efficiency on NSTX has been increased by a similar technique to 40-50% and future experiments are focused on achieving * 80% MC. MC efficiencies on both machines agree well with theoretical predictions. Ray tracing and Fokker-Planck modeling for NSTX equilibria are being conducted to support the design of a 3 MW, 15 GHz EBW heating and CD system for NSTX to assist non-inductive plasma startup, current ramp up, and to provide local electron heating and CD in high beta NSTX plasmas.},
doi = {10.2172/814023},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jun 10 00:00:00 EDT 2003},
month = {Tue Jun 10 00:00:00 EDT 2003}
}

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