Specifications include, but are not limited to: University requires a dilution cryostat that meets the following requirements: 2.1.1. Dilution cryostat expected base temperature: less than 30 mK 2.1.2. Dilution cryostat cooling power at 100 mK: greater than or equal to 250 uW 2.1.3. The cryostat includes pulse tube cryocooler that cools the top two stages of the cryostat (PT1 and PT2) at approximately 50-60 K for PT1 and 3-4 K for PT2. 2.1.4. The pulse tube cryocooler cooling power at 4.2 K: greater than or equal to 0.9 W. 2.1.5. The pulse tube cryocooler cooling power at 45K: greater than or equal to 36 W. 2.1.6. The pulse tube cryocooler should be configured for ~ 208V, 3-phase, 60 Hz power. 2.1.7. The dilution cryostat cools down the stages below PT2 using circulation of Helium-3, Helium-4 mixture. The mixture circulation is managed by a gas- handling-system rack, which includes a dry roughing pump (e.g. scroll or roots pump), turbomolecular pump, and an additional compressor. 2.1.8. The system includes a liquid nitrogen trap that filters out contaminants from the helium-3/Helium-4 mixture as the mixture is circulated around the system. 2.1.9. The system includes a temperature controller and temperature measurements at the different stages of the cryostat: PT1 (approx. 50-60K), PT2 (approx. 3-4K), Still, Cold Plate, Mixing Chamber plates...
