波纹内导体返波振荡器的热腔特性
Hot characteristics of corrugated-inner-conductor backward-wave oscillator
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摘要: 导出了波纹内导体同轴慢波结构热腔色散方程，研究了周期波纹深度、电子注平均半径、电子注电流及加速电压对波纹内导体慢波结构的高频场时间增长率的影响。结果表明：慢波结构周期减小、波纹深度加深、电子注平均半径减小、电子注电流增大、加速电压增大均会使高频场时间增长率增大。建立了粒子模型并应用PIC粒子模拟软件进行仿真，对各影响参数进行优化，结果表明：当加速电压为0.5 MV、电子束电流85 kA、波纹周期长度4.4 cm、波纹幅度为0.23 cm、内轴平均半径为2.9 mm和外壁内径为4.4 cm时，可获得10 GHz，1.1 GW效率约25%的单频微波输出。Abstract: Hot dispersion equation is derived and solved of the slow-wave structure(SWS) of the corrugated-inner-conductor backward-wave oscillator(CICBWO), the particle-in-cell(PIC) model is constructed and calculated by PIC code. The results suggest an high frequency microwave is obtained with a frequency of 10 GHz, an average output power of 1.1 GW and a power efficiency of 25% when the acceleration voltage is 0.5 MV, the electronic current 8.5 kA, the corrugated period 4.4 cm, the corrugated magnitude 0.23 cm, the inner radius 2.9 cm and the inner radius of the outside wall 4.4 cm.
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