Abstract
ABSTRACT In this paper the physical mechanism and mathematical description of magnetically self-focusing electron beam are studied.The analysis of electron beam with weak pulsation in drifting tube filled with plasma was given,the beam with strong pulsation unde their pulsation properties were different,there exited a optimum plasma density when the other condition was set.The experimental studies are also reported of beam transmission in plasma channel based on Hollow Cathode Plasma(HCP) gun in University of Electronic Science and Technology of China(UESTC).The study shows that efficient transmission of electron beam in plasma channel can be reached by choosing the plasma f illing factor and voltage. Keywords: Magnetically self-focusing,Electron beam,Plasma channel,Transmission experiment 1. INSTRODUCTION In the conventional microwave tubes,the external magnetic field is used to express electron beam for accomplishing effective transmission and avoid spread and decrease pulsation of electron beam.In the microwave tube with plasma filled,because of Bannet effect
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