Abstract
LHe cryostats for superconducting magnets used in a space environment are required to have superior thermal insulation performance. In order to reduce the heat-in-leakage of radiation from outside the cryostat, vapor-cooled multi-stage radiation shield plates are inserted between the vacuum vessel and the liquid helium vessel, and a number of multi-layer insulation (MLI) layers are wrapped on each surface. The temperature distribution of the radiation shield and the heat-in-leakage are numerically evaluated, and the optimal combination of the shield plates and MLI layers is determined within the allowable weight.
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