Preparation method of magnesium oxide secondary emitter

Abstract

The invention discloses a preparation method of a magnesium oxide secondary emitter. The method is characterized in that metal nickel, silver and a silver-magnesium alloy are used as target materials and are alternately sputtered on the surface of an emitter to obtain a composite transition layer, the matrix emitting electrode of the composite transition layer and an evaporation source made of a volatilizable organic magnesium salt and alumina powder are put into vacuum equipment respectively, after vacuumizing, the evaporation source is heated to 200-300 DEG C, the matrix emitting electrode is heated to 600-900 DEG C, then oxygen and nitrogen are filled to sensitize the composite layer on the surface of the emitting electrode in an oxygen atmosphere, and the magnesium salt is decomposed on the surface of the emitting electrode and reacts with the oxygen to generate magnesium oxide which is directly attached to the surface of the matrix, so that the magnesium oxide secondary emitter is prepared. According to the manufacturing method of the secondary emitter of the electron multiplier for the cesium-beam tube, the manufactured magnesium oxide film is more compact and firmer, and the electron multiplier assembled with the secondary emitter can meet the requirement for long-time continuous use of the cesium-beam tube and the requirement for the service life of the cesium-beam tube.

Description

technical field [0001] The invention relates to an electron multiplier, in particular to a method for manufacturing a secondary emitter of an electron multiplier for a magnetically separated cesium beam tube. Background technique [0002] The cesium atomic clock is a key device for measuring the accuracy of space positioning in navigation and positioning systems and deep space detectors. It is used in high-speed communication networks and other ground, sea, air, space measurement and control and communication systems. The electron multiplier is the most important component of the cesium atomic clock, which directly determines the service life, main technical performance indicators and reliability of the cesium atomic clock. For a long time, the problem of short service life of electron multipliers has seriously restricted the engineering application of cesium atomic clocks. Under the long-term action of the electron beam, the bombardment resistance is weak, and the gain dec...

AI Technical Summary

Problems solved by technology

b class = "d_n"> [0006] purpose of the invention: the purpose of the invention is aimed at the deficiencies of the above-mentioned technology, and a kind of preparation method of the secondary emitter of electron multiplier for cesium beam tube of magnetic separation state is provided, so that the obtained oxidation The magnesium film is denser and firmer, which solves the problem of low gain of the existing electron multiplier, and the secondary emitter has weak bombardment resistance and too fast gain decay under the long-term action of the ion with high bombardment energy or strong electron beam current, which makes the assembly The electron multiplier of the secondary emitter can meet the requirements of long-term continuous use of cesium beam tubes and the life requirements of cesium beam tubes

Images