Thermalanalysis For High Frequency System Of CW Gyrotron

The gyrotron in aerospace, energy, communications, microwave radar directed energy weapons, medical and agricultural production and other fields have a very attractive application prospect. The gyrotron is the military power of the attention,because it is in the millimeter and sub millimeter wave has advantages of high peak power pulse and continuous wave power, with the advantages of growing, design of the cooling system of gyrotron is also facing new problems. In the case of high power gyrotron, loss due to their own material medium, generates heat, if not to generate heat for effective treatment, the thermal stresses beyond its range can bear will damage the certain vulnerable parts of gyrotron output window, such as cathode, high frequency system, etc.. Study on the mechanism of gyrotron radiation, to reduce the effect of thermal stress on its own, to improve the performance, life has become very urgent and importantThis thesis mainly analyses of thermal analysis and structural analysis of the output window and resonant cavity gyrotron. The output of EH11 mode output window size to optimize the design, the microwave power decrease the output window reflecting back to high frequency system; reduce the window because the microwave power absorbed by the dielectric loss of power, increase the capacity of the output window. Thermal analysis and deformation analysis of the resonant cavity, resonant cavity and avoid thermal deformation due to ohmic losses its overheating.The second chapter introduces the theory of heat transfer, deduced the convection in rectangular coordinates heat transfer differential equations, calculation of correlation type and different situations of convective heat transfer in tubes. Brief introduction of the basic functions of simulation process analysis of thermal analysis and thermal deformation related problems of FEM and thermodynamics finite element analysis software.The third chapter using thermodynamics finite element analysis software simulation and comparison of cavity wall vertical groove and the spiral groove two cooling methods. Calculated by CST and compared before and after the cold cavity parameters of cavity deformation, discusses the influence on the normal work of the resonant cavity deformation occurs.The fourth chapter through theoretical analysis, optimal design of the output window window size W band gyrotron output mode of Gauss. The output window of different medium window through the thermodynamics finite element analysis software simulation calculation of the temperature, found the beryllia ceramics suitable for W band high power gyrotron output window window. Comparison of different water velocities window cooling channels in the output window under the radiation effect, the flow velocity is 0.8L/min, the BeO ceramic output window film, its power capacity to achieve continuous wave power is about 210 kW. Finally, detailed thermal deformation analysis in the output window.