A Forevacuum Pulse Arc-Discharge-Based Plasma Electron Source

摘要

An arc-discharge-based electron source is described, which is designed for forming a pulsed wide-aperture electron beam in the forevacuum pressure range (4-15 Pa). At an accelerating voltage of 12 kV, a current of 80 A was extracted from the emitting surface with an area of 80 cm~2 in the submillisecond range of pulse durations. The current density distribution over the beam cross section is close to a Gaussian function, and the surface-averaged beam energy density in a pulse reached 10 J/cm~2.