Simulation for the Characteristics of Plasma of the Multi-gap Pseudospark Discharge
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A high-energy electron beam was produced by a multi-gap pseudospark device under high breakdown voltages. In this work, a simulation model was developed to ascertain the mechanism of the discharge process in the multi-gap pseudospark, which was verified by the triggered multi-gap pseudospark discharge experiment. The characteristics of the plasma were investigated for different anode voltages and pressures. Results suggest the formation of a virtual anode in the cathode aperture during the discharge process, followed by the release of an electron from the plasma in the triggered hollow cavity. The propagation velocity of the ionization wave stimulated by the electron beam is increased with pressure and applied voltage on the anode. The highest density of the particles was found in the region of the cathode aperture. The densities of the particles in the aperture of the intermediate electrodes are higher than at the right adjacent side gaps when the entire gap space is filled with the plasma. The peak of the electron distribution function is found to be situated at higher energies at the beginning of discharge, then the electron distribution function gets shifted to lower energies on the completion of discharge.
KeywordsTriggered multi-gap pseudospark Ionization wave Electron density Electron energy
The authors would like to thank Pro. Klaus Frank for a discussion regarding the multi-gap pseudospark discharge process. This work was supported in part by the National Natural Science Foundation of China under Grant No. 11705134, the Project funded by Shaanxi Province Postdoctoral Science Foundation (Grant No. 2017BSHEDZZ120) and the Natural Science Basic Research Plan in Shaanxi Province of China (Program No. 2018JQ1044).
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