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A 1K closed-cycle cryostat has been developed to provide continuous cooling to a photon detector below 2K. A two-stage 4K pulse tube cryocooler is used to liquefy evacuated vapor from a 1K pumping port to form a closed-cycle refrigeration loop. A 1K instrumentation chamber, attached to the 1K cooling station, is designed to operate with helium inside and provide more uniform cooling. The design of...