Abstract

Measurements of the microwave radiation produced when an intense pulsed ion beam propagated from a field-free region into a magnetized plasma are presented. The ion beam was initially charge and current neutralized by a comoving electron population. Upon entering the magnetized plasma, some of the neutralizing electrons were stripped from the ion beam by the magnetic field and replaced by plasma electrons which were accelerated to high velocities by a space-charge imbalance within the ion beam. Electron plasma waves at the background plasma frequency were driven unstable by the high-velocity plasma electrons.

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