Electronic gun of traveling-wave tube

Abstract

The invention provides an electronic gun of a traveling-wave tube. The electronic gun comprises a cathode, a cathode supporting component, a gun shell component, a control electrode and an anode. The diameter length of the cathode is 1 mm to 10 mm, the height of the cathode is 1 mm to 10 mm, and the weight of the cathode is 0.02 g to 2 g. The cathode is composed of a cathode head and a heating component, and the cathode head is made from a barium and tungsten material with the diameter being 1 mm to 10 mm, the height being 1 mm to 5 mm and the weight being 0.01 g to 1 g. The heating component is composed of a heater, a cathode cylinder and insulation media. The heater is formed by winding a tungsten filament or a tungsten-rhenium filament or a high-rhenium filament with the diameter being 0.01 nn to 1 mm, the cathode cylinder is made from a molybdenum and / or tungsten material with the thickness being 0.02 mm to 0.2 mm, the position between the heater and the cathode cylinder is filled with the insulation media which are formed by burning alumina powder, and the control electrode and the anode are electronic optical focus components of the electronic gun. The electronic gun improves heating efficiency of the cathode.

Description

technical field [0001] The invention relates to the field of microwave communication, in particular to an electron gun of a traveling wave tube. Background technique [0002] Traveling wave tube is an important electronic device in the fields of microwave relay communication, radar, electronic countermeasures and satellite communication. For traditional traveling wave tubes, especially those in the L, S, and C bands, the cathode size of the electron gun is generally large, and the cathode of the electron gun needs to work at a high temperature of about 1100 ° C. When the cathode is heated to work normally, the heat capacity is relatively small. Mostly, it takes a certain amount of time for the cathode heating element to heat the cathode from normal temperature to the working temperature, so the starting time of the cathode is generally not less than 3 minutes, that is, the starting time of the traveling wave tube. In modern fast-paced production and life, time is competitiv...

AI Technical Summary

Problems solved by technology

However, the start-up time of the cathode of the above-mentioned electron gun is generally not less than 3 minutes, resulting in a longer start-up time of the traveling wave tube, which cannot meet the rapid response capability requirements of the communication system.

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