Abstract
We present the results of laboratory studies of nonlinear interaction of a high-power microwave pulse with a nonuniform plasma. It is shown that at plasma densities just below the plasma resonance, the incident microwave decays into the plasma and the ion-acoustic modes. Resonance absorption of a short microwave pulse (with a typical duration of about one ion plasma period), which takes place at the plasma resonance, results in formation of a bunch of energetic ions with energies up to 10kT e. Interaction of this ion bunch with the sheath of an electrode immersed into the plasma has been studied experimentally. It has been found that the reflection of the ion bunch inside the sheath gives rise to an instability of the electron saturation current collected by the electrode. A qualitative model of the observed instability is presented.
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