Reseach On Frequency Hopping Of The Relativistic Magnetron

In the high power microwave effect as a research background conditions, the author analyzed the influence of different frequency of microwave for high power microwave system and Deeply researched the development and present situation of relativistic magnetron,raised the core content of this article: The frequency hopping technology of relativistic magnetron. The paper introduced the frequency hopping technology of RM is in essence between the two kinds of working mode( ? and 2 ?) jump, analyzed the working theory of different working mode, expounded the feasibility of frequency hopping technology.Based on a relativistic magnetron(RM) which has six common cavities, putting forward three kinds of schemes of relativistic magnetron frequency hopping technology through the theoretical analysis of the relativistic magnetron work interval B-H curve:①Change the working conditions can realize relativistic magnetron frequency hopping. Based on cylindrical cathode radius of 12.3 mm, changing working voltage or magnetic field can make the relativistic magnetron output frequency jump quickly. Particle simulation results show that: When the magnetic field is 7500 Gs, voltage at 1100 k V, the center of the output microwave frequency is 2.83 GHz,work in ? mode. Change the voltage to 1200 kV, the center of the output microwave frequency is 4.3 GHz,work in 2? mode. When the voltage magnetic field is 700 kV, magnetic field at 5750 Gs, the center of the output microwave frequency is 2.85 GHz,work in ? mode. Change the magnetic field to 5000 Gs, the center of the output microwave frequency is 4.3 GHz,work in 2 ? mode;②According to the change of high frequency field under different cathode radius, reached the conclusion: When the cathode radius is larger the RM is advantageous to the work in 2? mode. When the cathode radius is smaller the RM is advantageous to the work in ? mode;③ According to the theory of transparent cathode: When the number of the cathode metal strips equals the number of cavity, the RM is advantageous to work in 2 ? mode. Designed a transparent cathode has six sectorial structures. Putting metal strips on Angular position and anode blocks in alignment, the calculating results show that the relativistic magnetron work in 2? mode, and the output microwave frequency is 4.2GHz, output power is 0.7GW. Making each metal strip and each resonant cavity in alignment by rotating the position of angular orientation of the transparent cathode, Equivalent to increase the effective distance between cathode and anode, the simulation results demonstrate relativistic magnetron work in ? mode, and the output microwave frequency is 2.9GHz, output power is 0.9GW.Finally in the existing experimental conditions, the existing cylindrical cathode radius size is 12.2 mm, 13.4 mm, 13.9 mm and 14.8 mm. Due to the working conditions of the adjusting range is limited, when the radius is 13.9 mm, the result of the RM frequency hopping is obtained: When the working voltage is 592 kV, magnetic field is 3805.6 Gs, the output frequency is 3.9 GHz, work in 2 ? mode; When the working voltage is 672 kV, magnetic field is 4877.5 Gs, the output frequency is 2.53 GHz, work in ? mode. The experimental results show that regulate working conditions can realize frequency hopping technology of relativistic magnetron.