B103 センサー冷却用断熱消磁冷凍機の熱設計に関する研究(OS3 バイオマス・新燃料・環境技術(1))

抄録

In recent years, numerous space scientific missions are being planned which require very low temperatures and very low temperature environments Among them is cosmic microwave background radiation (CMB) The excellent full resolution of the X-ray detector which is used for CMB observations is obtained by cooling to below lOOmk The adiabatic demagnetization refrigerator (ADR) is cited as a refrigerator for generating temperatures in such a range ADR boasts high refrigeration efficiency at very low temperatures and further, has the advantage that it is not dependent on gravity since the cooling medium is solid At present, we are developing an ADR suitable for the CMB project Its prototype is the four-stage continuous-operation adiabatic demagnetization refrigerator (Continuous ADR) which has been developed previously First, proof-of-concept experiments of sensor cooling will be conducted using the existing CADR apparatus Improvements will be made based on the results, and the final goal is set as the development of a three-stage CADR The overall thermal design and the characteristics of the heat switch will be presented this time