Computer aided design and analysis of electron guns for injected beam crossed field amplifiers

In this paper a self-consistent computer aided CFA gun analysis program is discussed which can be used to solve for the characteristics of "long" crossed field guns with arbitrary electrode shapes and including the effects of space charge. The results of analyzing a "long" Kino gun are presented which show excellent agreement between the theoretical gun parameters and those obtained by the computer analysis. As an example of the design procedure, the results of designing a CFA gun and transition region with the accelerator at anode potential are given. The futility of the model is further illustrated by the results of some preliminary noise calculations made by simulating the noise characteristics of the beam at the cathode surface.