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Study on Electron Trajectory of Cathode of 500kW Tetrode and Thermal Analysis Verification

The 500kW tetrode can be used as a radio frequency power source for a radio frequency quadrupole (RFQ) accelerator. The cathode is the core component of the tetrode, which can emit a uniform electron column. The electron flow of a tetrode is one of the main factors that determine its life and working stability. These charged particles move among the electrodes under vacuum conditions to achieve energy exchange. In this paper, a three-dimensional solid model is established in the software CST for particle simulation experiments. The whole process from injection to collection of electrons is obtained. It can clearly reflect the energy conversion and collection of the electron flow among the electrodes. The radiation effect between the electrodes is analyzed by analyzing the trajectory of the electron flow, and the thermal analysis is verified by the finite element software ANSYS. In addition, the influence of the electron flow from the cathode on the radiation effect of other components is verified by the heat distribution. The thermal analysis results are basically consistent with the theory of particle simulation analysis.