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Follow on Google News | Cryocooler System with Recirculating Helium Gas Cools Continuous Transfer Type CryostatsJanis Research has developed a series of cryogen free, low vibration, closed cycled cryocooler systems that use recirculating helium gas as a direct replacement for liquid helium, to cool continuous flow cryostats without the use of LHe. Pulse tube-cooled (PT) and Gifford-McMahon (G-M) cryocooler options are available, in various capacities and base temperature configurations. Helium gas passes through a series of heat exchangers on the cryocooler, and then flows through the integrated vacuum insulated transfer line into the cryostat. After cooling the sample, the gas is then returned to the cryocooler for re-cooling and continued circulation. These recirculating gas cryocooler systems are available for use with almost any existing continuous transfer type cryostats, such as the Janis SuperTran series. The Model PT-7 pulse tube-cooled system shown below operates continuously with a base temperature of less than 7 K (with options for lower temperatures) End
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