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从拉氏方程出发,推导了大回旋电子枪(CUSP)的理论,得到了用于Ka波段螺纹波导回旋行波管大回旋电子枪的基本参数。通过CST-Particle Stuido 3D粒子模拟软件,分析了不同参数对大回旋电子枪横纵速度比、速度离散的影响,理论计算与粒子模拟结果相互吻合。研究发现,影响大回旋电子注质量的主要因素是阴极所处的位置,所以文中重点分析了阴极装配误差对电子注质量带来的影响。通过将理论与仿真设计相结合,最终得到一种工作电压70 k V,电流5 A,速度比1.0的大回旋电子枪,满足Ka波段螺纹波导回旋行波管对高质量电子枪的要求。
Based on the Laplace equation, the theory of large cyclotron electron gun (CUSP) was deduced, and the basic parameters of the gyro TWT gyro for Ka-band helical waveguide were obtained. Through the CST-Particle Stuido 3D particle simulation software, the influence of different parameters on the ratio of velocity to velocity is analyzed. The theoretical calculation and the particle simulation result are consistent with each other. It is found that the main factor affecting the mass of large gyro electron injection is the location of the cathode. Therefore, the paper mainly analyzes the influence of cathode assembly error on the electron injection mass. By combining theoretical and simulation design, a large gyro electron gun with a working voltage of 70 kV, a current of 5 A and a speed ratio of 1.0 is obtained, which meets the requirements of high quality electron guns for Ka-band gyro-SWR.