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We have observed the generation of high-energy electrons by longitudinal electrostatic waves in a beam-plasma system. We find a direct correlation between the measured field and particle spectra.

A theoretical study of the electrostatic field fluctuations of a bounded beam plasma system in the regime below threshold for growing oscillations is presented. The spectrum exhibits a triplet structure in the neighborhood of the beam line. The structure is predicted on the basis of the electrostatic wave emission model and the behavior of the dispersion relation for the bonded system.

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