Superfluid helium Dewar low-temperature constant-temperature testing device

Abstract

The invention discloses a superfluid helium Dewar low-temperature constant-temperature testing device. The device comprises a flange plate, an outer cylinder body, an inner cylinder body and a low-temperature pipeline system, the inner cylinder body is arranged in the outer cylinder body, an upper port of the outer cylinder body and an upper port of the inner cylinder body are connected in a sealed mode through the flange plate, four hanging rods are perpendicularly connected to the end cover face of the bottom of the flange plate, and a liquid nitrogen cold shield is arranged between the outer cylinder body and the inner cylinder body; the low-temperature pipeline system comprises a distribution valve box, a liquid nitrogen cold shield constant-temperature loop, a liquid helium inner barrel precooling cooling branch, a liquid helium inner barrel constant-temperature branch and a nitrogen vacuum pressure reduction branch. The superfluid helium Dewar testing device disclosed by the invention is good in space utilization rate and small in heat leakage, the heat leakage of the superconducting cavity during each test is reduced, the operation difficulty is simplified, and the testing efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of low-temperature superconductivity, in particular to a superfluid helium Dewar low-temperature and constant-temperature test device. Background technique [0002] The superfluid helium Dewar low temperature and constant temperature test device is a container for the performance test of the high frequency superconducting cavity at extremely low temperature by using the superfluid helium refrigeration technology to control the working environment at a low temperature of 2K and a negative pressure of 3000Pa. key equipment. The specific steps are: first let the cryogenic refrigerator system produce 4.2K saturated liquid helium and pass it into the Dewar before vacuumizing; after decompression and cooling to the 2K superfluid helium temperature zone, start testing the high-frequency superconducting cavity; during the test The generated 2K low-temperature helium passes through the low-temperature heat exchanger...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a superfluid helium dewar cryogenic constant temperature test device, which is used to solve the problems of the existing superfluid helium dewar cryogenic constant temperature test device, such as low utilization rate of the interlayer space, large heat leakage, and difficult pipeline docking operation.

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