Abstract
The spatial growing plasma wave excited by an electron beam been studied. The gradual change of the dispersion roots from the cold beam type to the hot beam type was observed and it was in good agreement with the theoretical prediction by O'Neil and Malmberg. The nonlinear saturation mechanism of the growing plasma wave was also interpreted by the change of the dispersion roots which was caused by the feedback effect of the wave on the beam particles. the harmonic spectrum near onset of the saturation did not show the power spectrum of ω -5 or ω -2.5 . The termination of the saturation level of the unstable plasma wave was observed for the case of the high beam current, but the mechanism is not clear.
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