基于单电子在电磁场中的运动理论, 对某过模微波器件, 用无箔二极管通过分析其导引螺旋管磁场和电子发射区电场的分布与相互关系, 证明了电子回流与电子束传输效率密切相关。效率实验研究表明: 对大尺寸导引磁场, 不同半径薄环阴极发射电子束电功率有较大区别; 如果电子束半径小于50 mm, 二极管效率大于95%; 如果电子束半径大于90 mm, 二极管效率小于75%。

This paper analyzes the distribution and correlation of electrical field and magnetic field located at the emission domain in the solenoid for the high power foil less diode using over-mode microwave device based the single electronic moving equations. It is confirmed that the electronic beam transmission efficiency is correlated with the reflux. The results from experimental research indicate that distinct power efficiency was explicated for the emission electronic beam from foil less diode with different radius cathode when the guiding magnetic field inside the magnetic solenoid was bigger. When the beam radius was 48 mm the electronic beam transmission efficiency was more than 95%, when the beam radius was more than 90 mm the efficiency was smaller than 75%.