Design of a 200keV high pulse current electron beam facility

In the paper, design of a 200 keV high pulse current electron beam facility is introduced. Physical parameters of the beam have been selected to satisfy the plasma experiment´s need. LaB₆ has been used as cathode material for its desirable qualities. Temperature distribution simulation in vacuum chamber has been finished. Because the maximum working temperature in the system is about 2400deg C, grid is made of Molybdenum which is heat-resistant. In order to get high pulse current and line shaping electron beam, shape of electrodes has been optimized. Electric field distribution and process of electron beam emission have been simulated with considering space charge effects. Ceramic flange´s electrics and mechanics properties have also been analyzed. Exit window is made of titanium with 40 mum thickness. During passing through the window, relationship between initial energy and energy loss of the electron beam has been obtained by MC simulation. Assembling of the facility has been finished and some parameters have been measured in testing experiments.