The Simulation Analysis And Optimization For The Electric Parameters And Thermal Performance Of A Pulsed Magnetron

The magnetron is a reentrant resonant field oscillator.It is a high power source in the microwave technique. The main characteristic is high efficiency and low operating voltage, the second is due to the simple structure and brings small volume and light weight, convenient use, reliable work, low cost et al. Now the magnetron used not only for the military, and have been widely used in industry, agriculture, medical health et al.Magnetron has got the extensive research when it was invented in the 1920 s, especially in during the second world war, because the beginning of the radar application, magnetron also got rapid development. Successively appeared a coaxial magnetron, variable frequency magnetron injection locked frequency magnetron, rapid changes of frequency magnetron and so on. A ku band pulsed magnetron is developed for users of microwave power source, Using HFSS and ANSYS software in the process of development of magnetron electrical parameters and thermal properties are analyzed and optimized simulation respectively, thus greatly improving the working reliability of magnetron, shorten the design cycle.Firstly magnetron development history, research status and development prospect are introduced in the paper. Then several important components of the magnetron including :resonance system, a magnetic circuit system, the energy output system, cathode assembly were analyzed, the contents as follows:1.Calculated and selected the magnetron interaction space resonator parameters and electrical parameters;The simulation model is established using HFSS high frequency resonant system simulation software, and the simulation of different depth of resonant system than that of the the resonant cavity size of best;The resonant system into pole, pole shoe of the join simulation effect of sepa-ration of the oscillation frequency of the magnetron and model, and then through thesimulation optimization, the optimization of the selection of the pole shape;2.The energy output of the magnetron system is introduced. By the impedance converter and energy output window is composed of two parts, the first selected according to the design requirements of the double ridged waveguide as theimpedance converter, and the size is determined by the empirical formula. Then select the box shaped windows for energy output window, establish the simulation model using HFSS high frequency simulation software, simulates and calculates the output window size different, through continuous optimization, selection of model sizeoptimal transmitssion performance and port standing wave;3.The magnetron resonant system was analyzed and calculated thermal properties,thermal simulation on the ANSYS simulation software, to determine whether it has suitable thermal performance distribution, then the verification test; Select the type of cathode assembly is properly, and the simulation model was established for the thermal simulation using the ANSYS simulation software, to deter-mine the cathode temperature and surface temperature distribution is uniform,and then use the test verification.Through optimization of each part of the magnetron, the system achieves better performance. Through the assembly, cold test, exhaust, aging process, and then test, the indicators of magnetron have reached the design requirements.