7. FRCにおける開放端磁場プラズマ : 開放端磁場プラズマの物理

概要

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Past particle transport studies on FRC plasmas are reviewed. In the closed field region, the long-held belief that the lower-hybrid-drift mode is responsible for particle transport is disproved and the possibility of the importance of an electromagnetic mode is pointed out. A kinetic-theoretical study on the transport in the open field region, in which mirror trapping, self-consistent ambipolar potential, classical collision, and collisionless pitch angle scattering near the magnetic X-point are taken into account, is introduced. In experiments, detailed measurements in the open field region were made possible by the realization of a low density FRC plasma using the technique of translation. From these measurements, plasma which diffused across the separatrix is shown to flow along the magnetic lines of force, while the flow velocity approaches the sound velocity, as with fluid flow through a duct. On the other hand, the fact that the empirical scaling law for particle confinement time does not depend on the plasma length seems to suggest that particles are lost through the loss cone in velocity space.
社団法人プラズマ・核融合学会の論文
1999-11-25