The Analysis Of Radiation-cooled Space TWT Collector

The Space Traveling-Wave-Tube(TWT) is an extremely important constitution of the satellite payload. The thermal characteristics, as a very important technical index, not only affect the output power of space TWT, but also affect the stability and reliability of the TWT. With the rapid development of the aerospace industry and the continuous emergence of the new materials, processes and technology, a great improvement is achieved in the type, quantity, performance and technical indexes of the TWT. However, a large thermal load is also introduced in the TWT development. The Collector, an important component of TWT, absorbs and releases the remaining energy, collecting electronics, and decides the average of the TWT. The remaining energy makes certain damage for the efficiency and lifetime of the TWT, and also affects the thermal stability of space TWT. For the purpose of directly radiating the heat to the outside space and reducing the heat conduction to the satellite platform, it is necessary to research the heat radiation on the collector of TWT.This paper studies the heat distribution of the space TWT collector. With the help of TWTCAD4.2 software provided by University of Electronic Science and Technology of China, the electron beam trajectory of the collector is simulated, and we get the heat distribution inside of the collector. When compared to the actual test results, we obtain the thermal load of the radiation-collector in the thermal analysis of radiation model.Based on the characteristics of the actual space traveling wave tube structure and considering the actual assembly process and other factors, this paper studies the heat dissipation problem of the space traveling wave tube, and analysis the factors that affect the thermal distribution of the radiation model. With a large number of experiments, the optical properties of radiator materials are researched, the emission coefficient and the absorption coefficient of the material surface were measured, and the morphology of the material surface was observed.In this paper, some practical application problems of the radiator are considered. For the effect on the heat distribution of the radiation model, not only the ambient temperature, radiation model material, radiation coefficient, contact resistance between collector and radiator, the heat flux in the outside vacuum space and other factors are researched, but also the processing technology of the radiator, the structure for easier assembled and keeping better contact between the adjacent parts are researched. This paper analyses the design method of radiator structure for the space TWT radiation-collector. With the help of the ANSYS software, the structure of the collector radiator is optimized, and the actual assembly and test are realized. An effective analysis method is provided by comparison of simulation results and test results, which further provides the parameter basis for the improvement of the TWT radiation ability in space circumstance. This paper obtains the radiator structure of TWT that is suitable for the actual space, and therefore has a certain practical value.