【摘要】 超导转变边缘传感器(TES)、动能感抗传感器(KIDS)等高性能低温探测技术日渐成熟，为天文学家解决“重子缺失”、原初引力波观测等关键科学问题提供了契机。这些低温传感器需要在极低温工作(300 mK以下)才能实现其高灵敏度。作为获得极低温的重要方法之一，绝热去磁制冷机(ADR)非常适合冷却这类高性能低温探测器。本文描述了一台二级绝热去磁制冷机，介绍了低温级顺磁盐工质FAA的制备方法。在初步测试中该制冷机低温级可获得100 mK以下极低温，为后续研究工作打下基础。更多还原

【Abstract】 High-performance low temperature detection technologies such as transition edge sensor(TES) and Kinetic Inductance Detectors(KIDS) are becoming more and more mature, which provides an opportunity for astronomers to solve key scientific problems such as “missing baryons”and primordial gravitational wave observation. These kinds of detectors need to work at very low temperatures(generally below 300 mK) to achieve its high sensitivity. As one of the important methods to obtain mK temperature, adiabatic demagnetization refrigerator(ADR) is a good candidate for cooling such high-performance low temperature detectors. In this paper, a two-stage adiabatic demagnetization refrigerator is described, and the refrigerant preparation of paramagnetic salt FAA is introduced. In the preliminary test, the ADR can obtain a temperature below 100 mK, which lays a foundation for subsequent research work.更多还原