High band magnetically insulated transmission line oscillator

Abstract

The invention belongs to the technical field of microwave sources in high power microwave technology, and specifically relates to a high band magnetically insulated transmission line oscillator with fast microwave oscillation starting and saturation and high power capacity. The high band magnetically insulated transmission line oscillator provided by the invention is of a circular symmetry coaxial structure and is composed of an outer cylinder, a gradient choke cavity structure, a main slow wave structure, an extraction cavity structure, a cathode, a carrier cathode and an electron collector. According to the high band magnetically insulated transmission line oscillator provided by the invention, since the gradient choke cavity structure is adopted, and the distance of first interaction cavities is increased, an electron beam emitted by a starting point of the cathode can pass by the surface of a first cavity, and fast microwave oscillation starting and saturation can be realized; moreover, the high band magnetically insulated transmission line oscillator provided by the invention can effectively reduce a radio frequency field, reduce the radio frequency breakdown risk of the slow wave structure and effectively improve the power capacity of the devices; and the high band magnetically insulated transmission line oscillator provided by the invention further increases the length of the cathode, can reduce the average emission current density of the cathode and is conducive to improving the electron emission uniformity on the surface of the cathode and prolonging the service life of the cathode. These improvements have important significance of improving the output power and pulse width of high ban MIMO.

Description

technical field [0001] The invention belongs to the technical field of microwave sources in high-power microwave technology, and in particular relates to a high-frequency band magnetic insulated wire oscillator with fast microwave start-up and saturation and high power capacity. Background technique [0002] Magnetically insulated transmission line oscillator (MILO for short) is a GW-level high-power microwave source. Compared with other microwave sources, MILO has become one of the most promising HPM devices because it does not require an external guiding magnetic field, and has the advantages of compact structure and light weight. [0003] Pf 2 The factor (the product of the microwave power P and the microwave frequency f square) is used as a measure of the performance of high-power microwave devices, which means that the power density of the microwave signal emitted from the fixed-size antenna acting on the target is proportional to the factor. In this sense, the increa...

AI Technical Summary

Problems solved by technology

However, there is a problem with the structure of the traditional low-frequency MILO used in the high-frequency band MILO: the electron beam emitted at the starting point of the cathode cannot pass over the surface of the first cavity of the main slow-wave structure, which will make the device start-up and saturation slower

Because the blade radius of the choke cavity is smaller than the inner radius of the blade of the slow-wave structure, the electron beam emitted at the starting point of the cathode cannot pass over the surface of the first cavity of the main slow-wave structure after passing over the structure of the choke cavity, which will Slow microwave start-up and saturation of the device

However, the slow microwave start-up and saturation in the microwave source will cause waste of the input electrical pulse width, making the output microwave pulse width of the microwave source device shorter and the energy efficiency lower

[0010] Therefore, the study of high-frequency MILO has important practical significance, and the problem of slow start-up and saturation of high-frequency MILO still needs further research

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