Project Description: 

This technology is a compact cryogenic pumping system for circulating small amounts of re-condensed cryogens in the ml/s range. Cryocoolers are widely used to cool samples, sensors or superconducting magnets. Often, a first stage provides the cooling for a thermal shield surrounding the cold head, the condensate storage vessel, and/or the object to be cooled. A second stage supplies the cold head. All may be placed in a cryostat. Often, the object is integrated into a larger unit and cannot be placed in a cryostat, cannot be directly connected to the cold head, is located remotely or in an environment that is not directly accessible. The invention relates to a compact and robust pumping system that is capable of providing a constant flow of a cryogenic liquid or gas to a remote load. It can be integrated into a standard cooling system, e.g. it may be directly coupled to the cold head of a cryocooler.


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