Traveling Wave Tube Depressed Collector Pole And Thermal Analysis

The traveling wave tube (TWT) is an important high-power microwave resource, which has been applied in many fields. In TWT, RF field extracts energy from the electron beam. The electron beam must interact with the traveling wave field at the approximate speed, so that the electronic efficiency is much lower. The multistage depressed collector (MDC) is an important method of improving the TWT efficiency. Simulating the electronic devices by computers, can make the design cost effective and reduce the repetition in the fabrication process. The scope of this is concerned with the study and simulation of MDC to improve the efficiency. A MDC with a refocusing system is simulated with the help of 2.5-dimensional software. Then there is a thermal analysis of TWT's MDC with ANSYS.Chapter 1 introduces this paper's research background and the development history of MDC and thermal analysis all over the world.Chapter 2 introduces TWT's theory and the principle of MDC. Refocusing system and the influence of the secondary electrons are analyzed. In this chapter, we also introduce the thermal analysis's formula and boundary conditions.In chapter 3, we deduce the field equation of the MDC, and then simulate the action between electron beam and high frequency electromagnetic field by the ORION soft. The simulated result is entrance condition, and then we design MDC with refocusing system.Chapter 4 introduces thermal analysis and thermal stress analysis of MDC by ANSYS software and then discusses the different number and different structure radiators. From the thermal stress analysis, we can know that the maximal displacement and the first thermal stress of the MDC, the results could help us to improve on the MDC.Finally, this paper presents a summary of the results and the comment on the further studies.