Design and simulation of beam-wave interaction system of 397 GHz clinotron
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摘要: 斜注管是返波振荡器的一种，通过电子注的倾斜，电子距离慢波结构更近，高频场更强，耦合阻抗和互作用效率更高，显著增加输出功率。对带状注斜注管的互作用系统进行了设计，并首次将双排齿慢波结构应用于斜注管。利用电磁模拟软件和3D粒子模拟软件对设计的斜注管的色散曲线和场分布进行了分析，并对其注-波互作用进行了模拟，可以得到大于100 mW的输出功率以及50 GHz的调谐带宽。输出功率在370.5 GHz频点处处达到峰值2.3 W，电子注电压7.0 kV，注电流120 mA，聚焦磁场1.0 T。Abstract: Clinotron is a modification of the backward-wave oscillator. In clinotron the electron beam is inclined to slow wave structure (SWS). Due to the inclined electron beam, electrons are closer to SWS and can interact with stronger electric field, which leads to a higher output power and interaction efficiency. In this paper, the interaction system of clinotron is designed, and the double corrugated waveguide SWS is applied in clinotron for the first time. The dispersion curves, field distribution and beam-wave interaction are simulated with electromagnetic codes and 3D PIC codes. The result shows that more than 100 mW output power and a 50 GHz tuning bandwidth can be obtained. The simulation results show that the maximum output power is 2.3 W at frequency of 370.5 GHz with beam voltage 7.0 kV, beam current 120 mA and guiding magnetic field of 1.0 T.
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Key words:
- clinotron /
- interaction system /
- sheet beam /
- double corrugated waveguide /
- terahertz
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图 3 CST微波工作室中建立的单周期慢波结构模型
Figure 3. Solid model of one single period slow wave structure (SWS) in CST
图 4 计算与模拟得到的斜注管慢波结构色散曲线
Figure 4. Comparison of calculation and simulation dispersion curves in the SWS
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