非周期同心圆弧折叠波导行波管的永磁聚焦系统设计

Design of Permanent Magnetic Focusing System of Concentric Arc Folded Waveguide TWT

摘要: 开展了对非周期折叠波导行波管永磁聚焦系统的研究。基于W波段非周期折叠波导行波管的技术指标，根据理论分析和电磁仿真，设计了一套均匀永磁聚焦的电子光学系统，并进行了实物加工与测试。仿真结果表明，在电子主通道直径0.3 mm，长度为40.5 mm的条件下，阴阳极电压差为6 kV，可以产生120 mA的电流，电子通过率100%。测试结果表明，在阴阳极施加6 kV的电压时，阴极发射电流为120 mA，电子通过率为90%，满足高频结构设计要求。

Abstract: A magnet focusing system for W-band concentric arc folded-waveguide traveling wave tube (TWT) is developed. Based on the technical specifications of W band concentric arc folded waveguide TWT, a uniform permanent magnet focusing system is designed and tested. The beam tunnel is 0.3 mm and the length is 40.5 mm. The simulation result shows that when the voltage between the anode and cathode is 6 kV, a current of 120 mA can be generated, and the beam transmission rate is 100%. The test result is in agreement with the simulation result. The test result shows that the beam transmission rate is 90% with a voltage of 6 kV.