Three-dimensional Simulation. Rising Sun Relativistic Magnetron

The particle simulation software of CHIPIC is self-developed by China, compared to similar particle simulation software, which has the advantage of graphical modeling and parallel computing. Based on the feasibility of simulating rising-sun relativistic magnetron by CHIPIC software, the rising-sun relativistic magnetron is simulated in 3D and researched on the parallel computing and optimization by the particle simulation software of CHIPIC.Firstly, the rising-sun relativistic magnetron is modeled and simulated in the same parameters by using the advanced software abroad and CHIPIC software respectively. Then, compared to the simulation results, verify the feasibility of CHIPIC software to simulate rising-sun relativistic magnetron. Analyze the pros and cons of three algorithms in CHIPIC, which is time-biased, high-Q, centered-difference respectively, for simulating the rising-sun relativistic magnetron, and ultimately this paper applies the high-Q algorithm.Secondly, the parallel computing of particle simulation software CHIPIC is applied in rising-sun relativistic magnetron, and analyze the relationship between the computational speed and the number of parallel computer, thereby reducing the computation time, speeding up the computation speed. When the iteration time is 50ns, the computing time reduces from 26.5 hours in a single computer (dual-core Intel core, CPU 3.00GHz, RAM 3.25GB) to 10.6 hours of parallel computing in six computers.Finally, discuss the effect of structure and operating parameters of the rising-sun relativistic magnetron for the oscillations, output power and efficiency by constantly changing them. Simulation found that: (1) adjusting the cathode-stem can effectively improve the startup speed ofπmode; (2)within a certain range, with the reduction of the cathode radius, the rising-sun relativistic magnetron's output power and efficiency both increase; (3)within a certain range, with the reduction of the cathode length, the operating current reduces and the output efficiency increases; (4)adjusting the depth of the small cavity can balance depth ratio of the big-small cavity, choosing a moderate depth can balance the impact of zero-mode component and mode isolation; (5)the increase of the coupling angle helps reduce the Q value, thereby enhancing the output power coupled, however, to a certain extent, Q value changes little with the coupling angle changing; (6)through the regulation of the applied voltage and magnetic fields, we found the output power and efficiency is better when the operating point is near the curve of synchronization conditions. Based the analysis of above factors, the rising-sun relativistic magnetron has been optimized, the simulation results show that: when the applied voltage is 750kV, the magnetic field is 0.68T, the tube output power reaches 2.6GW and the output efficiency to 23.7%, start-up time is 16ns in the frequency of 2.7GHz.