Parametric Lower-Hybrid Instability Driven by Modulated Electron-Beam Injection

Abstract
A modulated electron beam is injected into a low-β plasma parallel to the confining field to investigate the energy-transfer rate from the electron beam to the plasma. Parametric excitation of electrostatic lower-hybrid waves and ion-cyclotron quasimodes is experimentally identified. The temperature of both ions and electrons is observed to increase significantly concomitant with the growth of the instability.