分析了具有反射器的8 mm波段相對論繞射輻射振蕩器，其高頻系統(tǒng)為周期盤荷慢波結(jié)構(gòu)，并且在電子注的輸入端加有圓柱形同軸反射器。利用HFSS軟件計算S11參數(shù)來確定反射器的結(jié)構(gòu)尺寸。對該結(jié)構(gòu)進行了PIC模擬，分析了該結(jié)構(gòu)中注波互作用的非線性過程和反射器對該器件性能的影響。研究發(fā)現(xiàn)存在一個最佳反射器的位置，使注波互作用的效率高、頻譜好。
關(guān) 鍵 詞 相對論繞射輻射振蕩器; 反射器; HFSS軟件; 粒子模擬

Abstract A 8-millimeter-wave-band relativistic diffraction generator with a coaxial reflector is studied on this paper. High frequency system of the device is a slow-wave structure with a combination of rectangles and semicircles. A coaxial reflector is situated at the upstream entrance of the slow-wave structure. The parameter of reflector is obtained by calculating the S11 parameter by the software HFSS. The non-linear process of beam-wave interaction with the reflector is investigated on particle-in-cell (PIC) simulation. The result shows that there is the best location of the reflector, which makes the device have a maximum efficiency and single operation frequency.
Key words relativistic diffraction generator; reflector; HFSS software; particle-in-cell simulation