ビームプラズマ放電の実験

概要

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Characteristics of hot electron plasmas produced by beamplasma discharge are investigated both experimentally and theoretically. The experimental results on excited waves, selfsustained conditions, hot electron production mechanism and diffusion precess of charged particles are compared with the theoretical predictions. Ion plasma waves are found to be excited in such a plasma due to a coupling with slow cyclotron waves of the electron beam. Electron hybrid wave interaction with beam slow waves becomes essential in its burnout state. Self-sustained conditions of this discharge are determined in its parameter space. Production mechanism of hot electrons is examined from energy measurement of radiated X-ray, which gives a possible evidence of eiectron cyclotron heating in this RF discharge. Diffusion of charged particles (cold electrons) obeys ambiolar theory in quiescent plasma state, but in turbulent plasmas diffusion tends to occur with large diffusion coefficient beyond clasicas values, which is presumably due to anomalous enhancement of apparent collision frequencies.
社団法人プラズマ・核融合学会の論文