Reserch on the electron optical characteristic of ELV-8 accelerating tube

ELV-8 accelerator use flat lanthanum hexaboride as the cathode .The acceleration tube consists of alternating gradient section and equi-gradient section. Focusing of electron is completed by electrical fields of alternating gradient, which makes electron beam a laminar beam. The flat electrode of the electron gun makes the electrical fields before the gun uniform, so the electron optical characteristic of the accelerating tube is not sensitive to the initial condition and the replacement of electron gun is convenient.