Vacuum treatment method for multi-beam cathode assembly

Abstract

The invention discloses a vacuum treatment method for a multi-beam cathode assembly, which comprises the steps of firstly carrying out baking and gas exhausting on the cathode assemble so as to remove water vapor adsorbed to the inner and outer surfaces of a packaging glass tube, then carrying out electrified gas removing on the cathode assembly so as to extract gases and impurities adsorbed on a cathode, carrying out gas removing on an installed anode, applying DC voltage between the cathode and the anode so as to carry out anode gas removing, measuring cathode emission current under different pulse anode high voltages at different powers of a heater assembly, drawing a volt-ampere characteristic curve, and finally carrying out vacuum sealing on the cathode assembly so as to acquire a multi-beam cathode which is low in small in gas discharge amount and stable in emission current. The cathode assembly is high in vacuum treatment quality, an emission surface of the cathode is bright and has no obvious defect, the emission performance of the cathode assembly is good in uniformity, the stability is high, and the preservation period is long, thereby being capable of meeting requirements of travelling wave tube cathode preparation, and having good application prospects.

Description

technical field [0001] The invention relates to a vacuum treatment method for multi-injection cathode components, which belongs to the field of microwave electric vacuum technology. Background technique [0002] Compared with the traditional single-jet TWT, the main advantages of the multi-jet TWT are small size, light weight, and lower operating voltage. Therefore, increasing the output power of the whole tube must rely on improving the matched multi-jet TWT. Cathode emission current, when designing multi-injection cathodes, it is necessary to fully consider many factors such as ion bombardment resistance, high voltage resistance, poisoning resistance, vibration resistance, impact resistance, spark resistance, emission capability and long life. [0003] The bulk structure of the multi-injection cathode is composed of an active material that can produce metal barium and a tungsten-rhenium alloy sponge as a carrier. Its working mechanism is generally believed to be based on t...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a vacuum treatment method for multi-injection cathode assemblies to release the metal material of the cathode assembly in advance, aiming at the shortcomings of the existing multi-injection cathodes, such as the increase of outgassing, which has a great influence on the vacuum degree of the whole tube, and the emission current is unstable. The gas in the cathode is aged and activated. After the anode is degassed, it is tested to identify the size and stability of the cathode emission current, so as to meet the needs of the development of multi-injection traveling wave tubes, and has a good application prospect.

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