基于140 GHz兆瓦级回旋振荡器电子枪设计和研制，利用ANSYS热分析软件，建立相应的磁控注入电子枪模型，分析电子枪工作时阴极温度均匀性及热形变，尝试通过相关几何和电参数的调整，在改善阴极温度均匀性的基础上，尽可能消除热形变对电子轨迹质量的影响。通过对比相同加热功率下阴极发射带的实测温度及仿真温度，评价了仿真模型及结果的合理性，为阴极组件的实际设计提供了参考数据。

Based on the development of a magnetron injection electron gun(MIG) for gyrotron oscillator operating at 140 GHz and with about a megawatt output power, the temperature homogeneity of the cathode and thermal deformation of the MIG were analyzed with ANSYS code. Under an improved temperature homogeneity of the cathode, the geometrical and electrical parameters have been adjusted and optimized to eliminate the effect of thermal deformation on beam trajectory. The simulated temperature of the cathode will be compared with the tested one for evaluating the rationality of the simulation model, which may be helpful for the actual design.