Current Drive in Recombining Plasma

Fisch, P.F. Schmit and N.J.

Princeton University. Plasma Physics Laboratory.

关键词: Collisions, Current Drive, Ionization And Reconnection Wave Damping;    70 Plasma Physics And Fusion Technology Collisions, Current Drive, Ionization And Reconnection Wave Damping;   

DOI  :  10.2172/1062578
RP-ID  :  PPPL-4654
RP-ID  :  DE-ACO2-09CH11466
RP-ID  :  1062578

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来源: UNT Digital Library

【 摘 要 】

The Langevin equations describing the average collisional dynamics of suprathermal particles in nonstationary plasma remarkably admit an exact analytical solution in the case of recombining plasma. The current density produced by arbitrary particle fluxes is derived including the effect of charge recombination. Since recombination has the effect of lowering the charge density of the plasma, thus reducing the charged particle collisional frequencies, the evolution of the current density can be modified substantially compared to plasma with fixed charge density. The current drive efficiency is derived and optimized for discrete and continuous pulses of current, leading to the discovery of a nonzero "residual" current density that persists indefinitely under certain conditions, a feature not present in stationary plasmas.