Abstract

The interaction of an electron beam modulated near the ion-cyclotron frequency with a longitudinally magnetized inhomogeneous plasma is studied experimentally. At high levels of beam modulation above a certain threshold, the beam pumps the parametric decay instability into an electrostatic ion-cyclotron wave and a drift wave, and correspondingly plasma heating takes place rapidly. The energetic ion production above is interpreted as the ion-cyclotron parametric mode conversion that is pumped by the beam.

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