3 mm波段回旋速调管放大器设计与粒子模拟

设计了一支3 mm 波段基波回旋速调管,该回旋速调管工作在低损耗的TE01模式,包含四个谐振腔。首先使用线性理论确定工作参数的大致范围, 然后采用HFSS软件设计单个谐振腔,通过调整谐振腔尺寸和腔壁介质层参数使谐振腔的谐振频率和Q值符合设计要求, 最后使用粒子模拟程序优化设计了回旋速调管的互作用电路,研究了谐振腔参差调谐方案, Q值对回旋速调管性能的影响, 互作用电路的稳定性以及电子注参数变化对注-波互作用性能的影响。PIC粒子模拟结果表明,在电子注电压65 kV, 电流6 A, α(V⊥/V∥)1.5, 工作磁场3.6 T时,回旋速调管的3 dB带宽约为600 MHz,在93.7 GHz获得139 kW 的峰值输出功率,效率为35.6%,增益为28.4 dB。模拟中没有考虑电子注速度零散的影响。

Design and PIC Simulation of 3 mm Band Gyroklystron Amplifier

A 3 mm band four cavity gyroklystron was designed and simulated. The working mode was the low loss TE01 mode. Linear theory was applied to determine the initial operating parameters. The famous FEM code HFSS was used to optimization design of every single cavity. PIC simulation code was used to design the interaction circuit. Studies to determine the optimal stagger tuning and cavity Q values were performed. Circuit stability was investigated and the effect of beam parameter variation on circuit performance was also studied. Simulations show that a four cavity circuit operating in the TE01 mode at the fundamental of the cyclotron frequency can achieve 139 kW peak output power, 35.6% efficiency and 28.4 dB gain at a center frequency of 93.7 GHz with about 600 MHz full width half maximum (FWHM) bandwidth for a 65 kV, 6 A, pitch angle α(V⊥/V∥)1.5 and velocity spread 0% beam.