High-current hollow beam dynamics in RF electron guns

摘要

RF electron guns with a metal-dielectric cathode are able to generate intense beams with nanosecond currentudpulse duration. The plasma developed during the dielectric surface flashover in vacuum is the source of particles ofudthe cathode. Results of the computer simulation of dynamics of the beam of particles that are emitted from the surface of metal-dielectric cathode of a ring geometry are reported. The average emission current value on the cathodeudin the RF field is about few tens of amperes. Beam parameters obtained experimentally at the two-cell RF gun output are referred in the paper.