Cooling System
The Adiabatic Demagnetization Refrigerator
The detector of DIXE needs to operate stably in an extremely low-temperature environment below 100 mK, achieving such temperatures in space is particularly challenging. DIXE adopts a multi-stage cooling approach to achieve this goal: two pulse tube coolers and a Joule-Thomson cooler are responsible for sequentially lowering the system from room temperature to the liquid helium temperature region (~4 K), developed by the Technical Institute of Physics and Chemistry, Chinese Academy of Sciences (CAS). A two-stage adiabatic demagnetization refrigerator (ADR) is responsible for lowering the detector temperature from 4 K to the operating temperature of the TES microcalorimeter, maintaining fluctuations of less than 1 uK for about 9 hours. After the magnetic field is depleted, it is necessary to re-cycle the demagnetization refrigerator section. This part is developed by the Low Temperature Detector Laboratory of the Department of Astronomy at Tsinghua University.
