TIME-RESOLVED ENERGY-SPECTRUM OF A PSEUDOSPARK-PRODUCED ELECTRON-BEAM

For the first time a time-resolved energy spectrum of a pseudospark-pr oduced 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 Farad ay cup current waveforms measured at various bias voltages. The result ant spectrum reveals that the instantaneous beam energy is nearly mono energetic. The energy is monotonically decreasing in time and resemble s the anode-cathode voltage waveform. This suggests that electrons are accelerated by the full instantaneous anode-cathode voltage.