A vacuum design method for sealed cesium beam tube

Abstract

The invention discloses a vacuum design method of a sealed cesium-beam tube. An ideal vacuum degree or pressure can be obtained with a low cost, and the development success rate of the cesium-beam tube is increased. Firstly, the range of the work pressure of the cesium-beam tube is obtained according to a relation curve of the cesium-beam intensity and the pressure inside the cesium-beam tube, then according to the still standing time requirement of the cesium-beam tube, the air output of the material unit time and average air output rate of the material unit area when all components of the cesium-beam tube are subjected to still standing are obtained, through the combination of the air output in the unit time of components of a cesium furnace and the air output in the unit time of components of a detector after electrification, the total air output of the cesium-beam tube in the unit time is obtained, then according to the total air output in the unit time and the range of the work pressure of the cesium-beam tube, the minimal pumping speed of a sputter ion pump is calculated, the structure of the sputter ion pump is determined, and finally a degassing technology of the cesium-beam tube is formulated according to the average air output rate of the unit area of all materials of the cesium-beam tube. The vacuum degree of the cesium-beam tube obtained thereby meets a design requirement, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of magnetically separated cesium atomic clocks, in particular to a vacuum design method for a sealed cesium beam tube. Background technique [0002] The magnetically separated cesium atomic clock is the core equipment of the time-frequency system. It has the characteristics of high accuracy, good long-term stability, and basically no frequency drift. It is widely used in timekeeping, time service, time measurement and other fields. The physical part of the cesium atomic clock—the cesium beam tube—belongs to the electric vacuum device, which is composed of cesium furnace, microwave cavity, A magnet, B magnet, detector, multiplier, magnetic shield, graphite block, magnetic shield and other components. structure see figure 1 . [0003] The cesium atomic beam ejected from the collimator of the cesium furnace enters the microwave cavity after being selected by the deflection magnetic field A (provided by the A ...

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Problems solved by technology

[0004] However, so far, due to the lack of a systematic vacuum design method for the sealed cesium beam tube, the vacuum of the cesium beam tube can only be obtained through practical experience, and the result is either the vacuum degree is not ideal, or the cost is too high

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