Abstract
For the first time a time-resolved energy spectrum of a pseudospark-produced electron beam is constructed. A small portion of electron beam sampled at its axis is injected into a vacuum and the electrons passed through a negatively biased electrode are measured by a Faraday cup. The time-resolved energy spectrum is determined by analyzing the Faraday cup current waveforms measured at various bias voltages. The resultant spectrum reveals that the instantaneous beam energy is nearly monoenergetic. The energy is monotonically decreasing in time and resembles the anode-cathode voltage waveform. This suggests that electrons are accelerated by the full instantaneous anode-cathode voltage.
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