Electron Bernstein Wave Research on the National Spherical Torus Experiment

Off-axis electron Bernstein wave current drive (EBWCD) may be critical for sustaining non-inductive high {beta} NSTX plasmas. Modeling results predict that the {approx} 100 kA of off-axis current needed to stabilize a solenoid-free high {beta} NSTX plasma could be generated by by 3 MW of 28 GHz EBW...

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Bibliographic Details
Published in:AIP conference proceedings 2005-09, Vol.787 (1)
Main Authors: Taylor, G., Diem, S., Efthimion, P.C., Fredd, E., Hosea, J., Wilson, J. R., Bers, A., Decker, J., Ram, A.K., Bigelow, T.S., Carter, M.D., Caughman, J.B., Jaeger, F., Rasmussen, D.A., Wilgen, J.B., Ershov, N.M., Smirnov, A.P., Harvey, R.W., Preinhaelter, J.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BERNSTEIN MODE
BOOTSTRAP CURRENT
COMPUTERIZED SIMULATION
COUPLING
EFFICIENCY
ELECTROMAGNETIC RADIATION
ELECTRONS
GHZ RANGE
HIGH-BETA PLASMA
HIGH-FREQUENCY HEATING
MAGNETIC FIELDS
NSTX DEVICE
PLASMA SIMULATION
PLASMA WAVES
POWER DENSITY
RF SYSTEMS
SOLENOIDS
SPHERICAL CONFIGURATION
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Summary:Off-axis electron Bernstein wave current drive (EBWCD) may be critical for sustaining non-inductive high {beta} NSTX plasmas. Modeling results predict that the {approx} 100 kA of off-axis current needed to stabilize a solenoid-free high {beta} NSTX plasma could be generated by by 3 MW of 28 GHz EBW power. Synergy with the bootstrap current may enhance CD efficiency by {approx} 10%. EBW radiometry measurements on NSTX support coupling to EBWs by launching elliptically polarized electromagnetic waves oblique to the confining magnetic field. Plans are being developed to implement a 1 MW, 28 GHz proof-of-principle EBWCD system to test the EBW coupling, heating and CD physics at high rf power densities on NSTX.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.2098252