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

Harvey, R.W. ; Taylor, G.

Princeton University. Plasma Physics Laboratory.

关键词: Bootstrap Current;    Wave Interaction, Plasma;    Bootstrap Model;    70 Plasma Physics And Fusion Technology;    Tokamaks, Nstx;   

DOI  :  10.2172/836632
RP-ID  :  PPPL-4048
RP-ID  :  AC02-76CH03073
RP-ID  :  836632

美国|英语

来源: UNT Digital Library

【 摘 要 】

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.