Research On Heat Dissipation Technology Of The Collector Of Relativistic Klystron Amplifier

With the rapid development of higher power for high current relativistic klystron continuously, the demand on thermal performance of the device is also more and more strong in engineering. Collector is used for collecting the intense electron beam after it cross through the high frequency electromagnetic field. The device’s current efficiency is generally low now, the electron beam still has a high kinetic energy for collector so it will deposit large amount of heat, the improvement of collector’s thermal dissipation performance become the inevitable demand. Therefore, it is necessary to conduct more accurate thermal analysis and optimization for cooling system of collector.In this paper, one kind of relativistic klystron amplifier collector is concerned. First of all, estimated the device using steady state heat distribution method in theoretical analysis; second, accurately calculated the thermal performance of collectors with different cooling methods; last, a kind of improved structure of collector was designed. By comparing the effect of thermal dissipation of the old structure and the new one, the advantage of heat dissipation of new structure is analyzed.The main work of this paper includes:1.By using the classical theory of computational fluid dynamics and heat transfer, the thermal environment of the collector was analyzed, and the internal maximum temperature was estimated.2. For a kind of relativistic klystron amplifier collector with natural dissipation cooling system, the heat distribution of collector at every moment and the temperature curve of specific location of collector with the change of time is calculated by using transient thermal analysis method when the collector worked in repetitive operation.3.For two most commonly used collector in the aspect of heat dissipation, namely natural cooling system and water cooling system, difference of thermal performance between the two methods is analyzed by comparing the temperature curve of the two condition, so the advantage of water-cooling heat dissipation is verified.4.The existing structure of collector is improved. By calculating the curve of maximum temperature of the collector in different time, the improvement of the collector’s heat dissipation performance is analyzed, therefore provide a reference for the design of the collector.5.The fluid-solid coupling method is used to calculate the water cooling system’s thermal distribution, so the flow condition of the cooling water in the irregular pipeline is accurately obtained, which ensures the accuracy of the calculation results!"Through the thermal analysis and optimization design of the collector, we have provided some references for the design of high power relativistic klystron amplifier collector.