Two 2.3K Mechanical Cryocooler Systems

The National Institute of Standards and Technology (NIST) is seeking to purchase two 2.3K mechanical cryocooler systems. The systems must be capable of achieving a base temperature of 2.3K or colder, with a cooling power of 0.1W or greater at 4.2K. The systems will be installed into existing cryostats that are designed to accommodate a Sumitomo RDK-101DL cryocooler or equivalent in dimensions and all other specifications. The key requirements for the systems include: • At least 0.1 W of cooling power at 4.2K • Air-cooled compressor that uses 120VAC power • Must match standard Sumitomo RDK-101DL size and dimensions to fit into NIST-designed, NIST-assembled cryostat • Flexible helium lines connecting compressor to cold head must be no shorter than 6 feet and no longer than 15 feet • Base temperature of 2.3K or lower