Abstract
In this paper, a three-channel coaxial liquid helium pipe with three support structures and typical MLI materials was designed. Heat leakage of cryogenic transfer lines has been experimentally analyzed for MLI with different layer density & number of layer and three support structures, based on an experimental cryogenic transfer lines test platform. The experimental results show that the minimal heat leakage of MLI was 0.488 W/m under the conditions of MLI with 50 layers and 25 layers cm-1.The heat leak of two-plate support structure is 0.200 W per one, which decreases by more than 54% comparing to triangle support. After optimization, the total heat leakage of liquid helium cryogenic transfer line was reduced to 0.688 W/m, which has been successfully applied in 250 W @ 4.5 K helium cryogenic refrigerator.
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