Efficient Generation of Non-Inductive, Off-axis, Ohkawa Current, Driven by Electron Bernstein Waves in High Beta, Spherical Torus Plasmas | |
Taylor, G. ; Efthimion, P.C. ; Kessel, C.E. ; Harvey, R.W. ; Smirnov, A.P. ; Ershov, N.M. ; Carter, M.D. ; Forest, C.B. | |
Princeton University. Plasma Physics Laboratory. | |
关键词: Wave Interaction, Plasma; Trapped Electrons Current Drive; 70 Plasma Physics And Fusion Technology; Spherical Torus; Simulation; | |
DOI : 10.2172/827839 RP-ID : PPPL-3943 RP-ID : AC02-76CH03073 RP-ID : 827839 |
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美国|英语 | |
来源: UNT Digital Library | |
【 摘 要 】
Off-axis rf-driven current can play a critical role in sustaining high Beta spherical torus (ST) plasmas without a central solenoid. Numerical modeling of electron Bernstein wave current drive (EBWCD) for a {Beta} {approx} 40% ST plasma predicts efficient, off-axis, Ohkawa EBWCD. Current can be efficiently driven at r/a greater than 0.5 where the large trapped electron fraction precludes conventional Fisch-Boozer current drive and provides near-ideal conditions for Ohkawa EBWCD. Also, Ohkawa EBWCD efficiency increases with r/a. Enhancement over Fisch-Boozer current drive is a factor of two at r/a {approx} 0.2 rising to over an order of magnitude at r/a {approx} 0.5.
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