Cryocooler System with Recirculating Helium Gas Cools Continuous Transfer Type Cryostats
September 12, 2014
The ongoing global helium shortage continues to adversely affect researchers, many of whom are unable to use these their existing continuous transfer cryostats to perform research due to high operating costs or limited LHe availability.
Woburn, Massachusetts, USA – September 9, 2014 – Janis Research is now offering a solution to help researchers that have limited operating budgets but that can gain access to capital equipment funding.
Janis 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). The interchangeable system transfer line tips make the cryogen free cryostat universal for all Janis SuperTran cryostats including Models ST-100, ST-300, ST-400 and ST-500. The microscopy cryostat system as shown can, with proper mounting, maintain the vibration level on the cryostat body at less than 20 nm.