Properties of a two stage adiabatic demagnetization refrigerator

[摘要] Currently, many space missions using cryogenic temperatures are being planned. In particular, high resolution sensors such as Transition Edge Sensors need very low temperatures, below 100 mK. It is well known that the adiabatic demagnetization refrigerator (ADR) is one of most useful tools for producing ultra-low temperatures in space because it is gravity independent. We studied a continuous ADR system consisting of 4 stages and demonstrated it could provide continuous temperatures around 100 mK. However, there was some heat leakage from the power leads which resulted in reduced cooling power. Our efforts to upgrade our ADR system are presented. We show the effect of using the HTS power leads and discuss a cascaded Carnot cycle consisting of 2 ADR units.

[发布机构] Environment and Energy Materials Division, National Institute for Materials Science, Tsukuba, Ibaraki; 305-0003, Japan^1;Department of Urban Environment System, Chiba University, Chiba; 263-8522, Japan^2

[效力级别] 物理学 [学科分类] 材料科学（综合）

[关键词] Adiabatic demagnetization refrigerators;Continuous temperature;Cryogenic temperatures;High resolution sensors;Space missions;Transition-edge sensors;Ultra low temperatures;Very low temperatures