二次谐波回旋行波管Cusp电子枪的模拟与实验研究

 利用3D PIC软件和乌克兰开发的电子光学计算软件TAU对二次谐波回旋行波管Cusp电子枪进行模拟，提取电子的3维运动速度计算横纵速度比。在阳极电压和阴极电流变化的条件下，对电子速度比和速度零散随之而变化的情况进行了模拟，得到平均速度比1.1和平均速度零散9.5%的结果。基于电子平均半径，并根据电子平均半径与横向速度、纵向速度的关系提出了一种实验测量速度比的方法。当电子轰击荧光屏玻璃时，玻璃上的荧光物质感应到光斑，测量空心光斑的平均半径可计算得到电子速度比，其结果与模拟值误差15%。

Simulation and experiment on Cusp gun for second harmonic Gyro-TWT

The Cusp electron gun for second harmonic Gyro-TWT is simulated by the three dimensional PIC software and Ukrainion electronic optical software TAU,and the electronic 3D velocity value is extracted to calculate the velocity ratio of the transverse velocity and longitudinal velocity.With the anode voltage and the cathode current changing,the variational process of the electron velocity ratio and spread is simulated,and the results of the average velocity ratio 1.1 and spread 9.5% are obtained.Based on the mean radius of the electron beam and the relationship between the radius and the transverse,longitudinal relocity,an experimental method of measuring the electron velocity ratio is put forward.When the electron holding some energy shock at a fluorescence glass,the light spot induced in the fluorescence glass is caught by a camera,then the mean radius of the light spot is measured by some graphics soft.On the basis of the mean radius of the light spot,the electron velocity ratio is calculated.The error is about 15% compared with the simulation result.