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Results of high-current electron beam generation in an ϳ200 kV, ϳ250 ns diode with a multicapillary dielectric cathode ͑MCDC͒ assisted by either velvet-type or ferroelectric plasma sources ͑FPSs͒ are presented. Multicapillary cathodes made of cordierite, glass, and quartz glass samples were studied. It was found that the source of electrons is the plasma ejected from capillaries. The plasma parameters inside capillary channels and in the vicinity of the cathode surface were determined duringdoi:10.1063/1.2887922 fatcat:ykmduzqrgfcjlfn3vt2sbvoowq