Thermalanalysis Of CW Gyrotron

Gyrotron not only can work efficiently and stably in the millimeter-wave and submillimeter wave band, but also can produce high-power, wide bandwidth and high efficiency millimeter wave source. It has a very attractive application prospect in communication, radar, electronic warfare, controlled thermonuclear fusion, microwave weapons and medical equipment, etc. However, with the continuous wave power and the pulse peak power produced by the gyrotron increasing, the difficulty of tube in the cooling system design will be more difficult. When gyrotron operates normally, it will lose part of power due to its material itself having dielectric loss, so generating heat. It may damage the certain vulnerable parts of gyrotron if the waste heat can not be effectively eliminated. Therefore, it is necessary to analyze the cool mechanism of each part of the gyrotron to enhance the working performance and the life span of the gyrotron.This paper is to make use of the ANSYS software for studying the heat dissipation and thermal strain of the output window and the collector in detail.The ways of applying different cooling methods that affect the distribution of the output window and the collector temperature are compared. And the effects of thermal stress on their working performance and structure are involved. The main studies are as follows:1. Brief description of the basic theory of heat transfer and the ANSYS softwareIt is a brief introduction to the theory of heat transfer, and an analysis of the experimental correlations of convective heat transfer under different conditions.Briefly introduces two basic functions of the ANSYS software: the thermal analysis and the thermal stress analysis.2. The thermal and structural analysis of gyrotron beryllia output windowThe output window,whose quality has direct influence to the performance,reliability and service life of gyrotron, is one of very important parts of gyrotron.It keeps gyrotron under vacuum and transfers energy. In this paper the thermal and structural analysis of gyrotron beryllia output window is studied.Firstly, it analyzes the design requirements of the output window, compares the performance of different materials and selects the beryllia ceramic as the window material.Then it calculates the power loss of output window and the convective heat transfer coefficient. Finally, theANSYS software is used for thermal and structural analysis of the output window.The analysis results show that the beryllia ceramics is suitable for output window of the gyrotron.3. The thermal and structural analysis of gyrotron collectorWhen the gyrotron operates normally, due to bombardment by the electron beam, the collector produces a lot of heat. It causes the temperature of the collector reaching hundreds of degrees Celsius, which affects the sealing performance and the degree of vacuum.This paper uses the ANSYS software to simulate the thermal characteristics of the collector, and to optimize the relevant parameters of the collector heat dissipation structure.The results show that the collector thickness,the number of axial grooves,the groove height and the groove width have different effects on the temperature distribution.Through comprehensive comparison, an ideal cooling system is designed. The contents and results of this paper can provide a reliable design guidance for the practical engineering design.