Design and optimization of electron gun used in high efficiency travelling wave tube

A synthesis method for Pierce gun design is employed to develop a prototype. In order to evaluate the performance of the electron beam, an objective function is introduced, which takes perveance, beam waist and laminarity into consideration. A direct optimization method and the EGUN program are applied to optimize the objective function, the result has attained the goal of the design very well. This gun has been applied in experiment as a part of a travelling wave tube, and the rationality was approved through the good performance with the electron static transmission rate of 99.7%, the electron dynamic transmission rate of 98% and the electron efficiency over 34%.