10-keV Electrons Transmission through a Set of Dielectric Macrochannels

Abstract

⎯The results of the study of the 10-keV electron beam transmission through cylindrical dielectric macrochannels with various lengths. All channels made of polyethylene terephthalate had an identical inner diameter of 1.55 mm and lengths of 20, 30, 35, 40, 45, and 50 mm. The dependence of the current passed through beam channels on their tilt angle relative to the incident electron beam is measured. The electron beam fraction suffered energy losses no more than 1 keV after passing through the dielectric channel is estimated. The dependence of the maximum electron transport through channels on their length is also studied. The data obtained show that the passed current intensity weakly depends on channel lengths in the length range of 20-50 mm under study. These results can be explained by the fact that such a dynamic charge distribution is formed on channel walls, which provides the best conditions of electron transport through the dielectric channel.