Cathode-adjustable single anode magnetic control electron gun

Abstract

A cathode-adjustable single anode magnetic control electron gun belongs to a single anode magnetic control electron gun that is used in conjunction with a vacuum gyrotron, and comprises an electron gun casing, a base, an electric heating wire component, a support cylinder, a regulating mechanism assembly, an electron gun cathode, a fixed annular plate, an anode and a retainer ring, wherein, the electric heating wire component comprises an electric heating wire, an electric heating wire sleeve and insulating fillers, and the electric heating wire sleeve is provided with a ring-shaped scale section, a threaded section and a guiding plane surface; the regulating mechanism assembly is arranged between the electric heating wire sleeve and the support cylinder thereof, and comprises an adjusting screw nut; in addition, the cathode-adjustable single anode magnetic control electron gun can adjust the distance between the cathode and anode according to the operating condition, the transverse to longitudinal velocity ratio of an obtained electron beam is greater than 1.0, and the longitudinal velocity spread is less than 2 percent. Therefore, the influence caused by assembly error and overheating deformation or great current and voltage variation of the electron gun can be overcome effectively, and the cathode-adjustable single anode magnetic control electron gun is characterized in that working current and voltage capable of adapting to wider range can be achieved, the discreteness of the electronic longitudinal velocity is low, the performance of the electron beam is excellent, and the power and the efficiency for later beam-wave interaction of the gyrotron can be improved and so on.

Description

technical field [0001] The invention belongs to the single-anode magnetron electron gun in the technical fields of high-power microwave, millimeter wave and submillimeter wave, in particular to a cathode-adjustable single-anode magnetron electron gun matched with a vacuum gyrotron. Background technique [0002] High-power gyrotron plays an extremely important role as a high-power microwave source. With the research of gyrotron in millimeter-wave radar, communication, and high-power microwave weapons, especially controlled thermonuclear fusion, the attractiveness of high-energy physics and industry Prospects have promoted the development of the gyrotron, and the requirements for the power and efficiency of the gyrotron are getting higher and higher. Since the quality of the electron beam has a great influence on the interaction efficiency of the gyrotron injector wave, the helical electron beam provided by the gyrotron magnetron injection gun (MIG) must satisfy the following ...

AI Technical Summary

Problems solved by technology

The rear part of the support cylinder in the electron gun is fastened in the center hole of the base, the heating wire assembly is fixed on the axis in the electron gun shell through the support cylinder, and the cathode of the electron gun is fastened to the front end of the heating wire sleeve through its fixing ring plate. The rear part of the anode of the electron gun is embedded in the inner wall of the front part of the electron gun housing and covered on the cathode, and is fastened to the housing through its fixing ring (see attached figure 1 ); although the electron gun has a relatively simple structure, since the heating wire assembly and the cathode of the electron gun are fastened into one body through the support cylinder and the base, there are: First, the assembly process requirements are high. If there is a deviation in the design requirements, it cannot be adjusted; the second is that the thermal deformation caused by the uneven heating of various components during the working process or the excessive change of the working current and voltage will cause the relative position of the cathode and anode to shift, and the electric field on the surface of the cathode will change; The above two situations will lead to the occurrence of disadvantages such as the increase of the dispersion of the initial electron velocity and the decrease of the injection wave interaction efficiency when the electron gun is working.

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