Electron Bernstein Wave Research on the National Spherical Torus Experiment

Taylor, G. ; Bers, A. ; Bigelow, T.S. ; Carter, M.D. ; Caughman, J.B. ; Decker, J. ; Diem, S. ; Efthimion, P.C. ; Ershov, N.M. ; Fredd, E. ; Harvey, R.W. ; Hosea, J. ; Jaeger, F. ; Preinhaelter, J. ; Ram, A.K. ; Rasmussen, D.A. ; Smirnov, A.P. ; Wilgen, J.B. ; Wilson, J.R.

Princeton University. Plasma Physics Laboratory.

关键词: Heating;    Bootstrap Current;    Magnetic Fields;    70 Plasma Physics And Fusion Technology;    Simulation Current Drive;   

DOI  :  10.2172/839173
RP-ID  :  PPPL-4066
RP-ID  :  AC02-76CH03073
RP-ID  :  839173

美国|英语

来源: UNT Digital Library

【 摘 要 】

Off-axis electron Bernstein wave current drive (EBWCD) may be critical for sustaining noninductive high-beta National Spherical Torus Experiment (NSTX) plasmas. Numerical 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 via Ohkawa current drive with 3 MW of 28 GHz EBW power. In addition, synergy between EBWCD and bootstrap current may result in a 10% enhancement in current-drive efficiency with 4 MW of EBW power. Recent dual-polarization EBW radiometry measurements on NSTX confirm that efficient coupling to EBWs can be readily accomplished by launching elliptically polarized electromagnetic waves oblique to the confining magnetic field, in agreement with numerical modeling. Plans are being developed for implementing a 1 MW, 28 GHz proof-of-principle EBWCD system on NSTX to test the EBW coupling, heating and current-drive physics at high radio-frequency power densities.