Abstract
The objective of this study is to develop a source of steady-state, low-emittance (< 0.25 eV energy spread), high-current (> 10 A) electron beam. The concept is based on the selection and extraction of the high-energy component of the electrons from a hollow cathode plasma. This low-emittance electron gun would be very valuable in extending the capabilities of various devices when used as a replacement for the Pierce-type electron guns that utilize thermionic cathodes. In order to design an efficient electrode configuration for this device, we use a Monte Carlo code to simulate the electron kinetics and determine the electron energy distribution. The effects of gas pressure and hollow cathode geometry on the current and emittance properties of the electron beam are studied.
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