Speaker
Description
The heat leakage of cryogenic transfer lines directly influences the performance of the large-scale helium refrigerator. In this paper, the thermal mode of cryogenic transfer line considering temperature distribution and heat leakage of support and multilayer insulation was established. To validate the model, the test system of cryogenic transfer lines with good thermal shield and changing easily heat insulating material has been built. The experimental result of the heat leakage through the overall length, support and the multilayer insulation were obtained and the overall leakage is 1.58W/m. The differences of heat leakage and temperature distribution between experimental and simulated results were less than 7%, which verifies the theoretical model in this paper. In order to reduce the overall heat leakage of cryogenic transfer lines further, the optimized structure of support will be designed based on the above analysis of the thermal model and test system in the near future.
Key word: cryogenic transfer line; heat leakage; multilayer insulation; support; large-scale helium refrigerator
Acknowledgement
This work was supported by the fund of National Research and Development Project for Key Scientific Instruments. (ZDYZ2014-1)