Study on the Properties of Photoemission Electron Beam Produced by a Pulsed Photoemission Electron Gun

By using the new designed pulse photoemission gun,the energy distribution of photoemision electron beam,the relationship between the number of photoemission electrons and the intensity of laser and the duration of photoemission electrons in ionization region were studied.Most of electrons have the excess energy which laser induce photoemission electrons leave,but the energy distribution of electrons is widened by the space charge effect of electrons.For on pulse,photoemission electron density with about 109～1010/cm3 in the ionization region was found.