Thermal Analysis And Optimized Design Of Electron Optics For Gyrotron

As a new high-power millimeter-wave device, gyrotron possess of high-power and high gain. It is widely used in ares such as submillimeter-wave radar, communications, electronic warfare, high-power microwave weapons, and controlled nuclear fusion controlled. Gyrotron traveling wave tube amplifier is considered as the main types, it gained rapid development in recent years.With the rapid development of the cyclotron TWT, its stability, reliability and longevity are increasing demanded. The thermal quality of the Electron optical system restricted the gyrotron performance directly. This article studies the thermal properties of the optical system, including electron gun cathode and collector. The performance of the cathode structure is optimized to improve the heating efficiency. A new collector structure is presented to enlarge the power capacity. The main aspects of this paper are as follows:1. Describes the Gyrotron electro-optical system theory, adiabatic compression theory, the cathode heat mechanism and other related theories. Cathode thermal heat mechanism is to analyze the efficiency of the cathode, and adiabatic compression theory is the basic to research high power collector.2. The basic theory of thermal analysis is elaborated, and the finite element thermal analysis software ANSYS Workbench features and functions are outlined.3. Thermal analysis of Ka-band gyro-TWT cathode is made and its structure is optimized by slitting the support and adding heater screen. The influence of different angle and the number of slits is given. The results show that the optimized structure improves the cathode efficiency of about 50%. At the same time, this paper analyzes the cathode start-up time and methods to reduce the startup time.4. According to the theory of electron trajectories, this paper puts forward an innovative slope collector slope and optimizes its structure with CST. The collection of electronic distribution tends to be uniform, which greatly improves the capacity of the power collecting electrode and solving the problem of local overheating.