Simulated Comparison of Two Anode Types of Coaxial Electron Gun for 170GHz Gyrotron

The simulated comparison of two anode types of coaxial electron gun has been presented in this paper. The calculated results simulated by CST code indicate the electron gun could generate great quality electron beam both in two anode types. No reflected electron occurs and the laminar beam is obtained. The transverse velocity spread for single-anode gun and double-anode gun are 3.79% and 1.92% with the identical velocity ratio 1.3.