使用有限元分析软件ANSYS对回旋行波管电子枪阴极进行了热分析和形变分析，得到了阴极模型的温度分布和热形变。为了保持阴极发射带表面温度的均匀性，增大了发射带下端与导热介质的接触面积，同时减小了发射带上端处的加热线圈个数，发现温度差由原来的18 ℃减小到了0.9 ℃。在热分析的基础上进行了热形变分析，将形变量结果带入EGUN软件验证，发现电子注的速度比增大，横向、纵向速度零散以及引导中心半径也都有所增加。

The paper presents the thermal and deformation analysis of electron gun cathode for GyroTWT using the finite element analysis software ANSYS, which obtains the temperature distribution and thermal deformation of the cathode model. In order to maintain the uniformity of surface temperature of the cathode emitter, the contact area of the thermal conductive medium with the emitter bottom is extended and the amount of the heater coil near the top of the emitter is reduced, the temperature difference decreases from 18 ℃ to 0.9 ℃. On the basis of the thermal analysis, thermal deformation analysis is demonstrated and the velocity ratio, longitudinal and transverse velocity spread, guide center radius all increase in EGUN code simulation.