Design and Large-Signal Beam-Wave Interaction Research of Coupled-Cavity Traveling-Wave Tube
Li Wen-jun①②; Xu Zhou②; Lin Yu-zheng①; Jin Xiao②; Li Ming②; Yang Xing-fan②; Zhou Lin②
①Department of Engineering Physics, Tsinghua University, Beijing 100084, China; ②Institute of Applied Electronics, Chinese Academy of Engineering Physics, Mianyang 621900, China
Abstract:An important characteristic of the beam-wave interaction in traveling-wave tube is that the velocity modulation and bunching of electron beam, also its energy exchange with the RF field, happen continuously and simultaneously along the whole slow-wave structure. This is why traveling wave tube can offer large output power in a very broad band. On the basis of cold cavity characteristic research, quantitative analysis of the large signal beam-wave interaction of coupled-cavity traveling-wave tube is performed using three-dimensional PIC simulation code. In addition, an X-band CW coupled-cavity traveling-wave tube is designed with the design parameters as follows:operating frequency from 7.1GHz to 8.5GHz,bandwidth 18%,the highest output power of 3kW.