Electrostatic Ion-Cyclotron Oscillations Induced by an Emissive Disc Plate Floating in a Plasma.

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  • Aoyama Keiichi
    Department of Electronic Engineering, Tohoku University, Sendai 980
  • Hatakeyama Rikizo
    Department of Electronic Engineering, Tohoku University, Sendai 980
  • Ding Weixing
    Department of Electronic Engineering, Tohoku University, Sendai 980
  • Sato Noriyoshi
    Department of Electronic Engineering, Tohoku University, Sendai 980

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  • Electrostatic Ion Cyclotron Oscillation

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Abstract

Measurements have been performed on ion cyclotron oscillations inducedby a small emissive disc plate floating in a magnetized collisionlessplasma column. The oscillations are observed when the emission is solarge that the disc potential is higher than the plasmapotential. This means that the oscillations are generated even in theabsence of dc electric current passing through the plasma column ifthe disc potential is positive with respect to the plasmapotential. The situation is in contrast with the case of applyingpositive potentials to a small cold disc plate to generate the ioncyclotron oscillations, where a dc electric current is induced alongthe plasma column. Main features of the oscillations are consistentwith the “potential-driven” model for the generation of ioncyclotron oscillations.

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