Abstract
A phase-space distribution of a weak electron-beam injected into a cold plasma is experimentally investigated in electron time scales. It is shown that electron-beam holes in phase-space evolve dynamically from appearance to collapse, as synchronized with a wave packet dominated by a beam mode. The dependence of the hole velocity radii on the packet crest amplitudes indicates that the holes are induced by self-trapping of the beam. It is found that the beam is well trapped while the packet grows linearly, but easy to be detrapped after that.
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