Device and method for transferring liquid helium into an application cryostat

A device for transferring liquid helium into an application cryostat, comprising:

• a storage dewar for liquid helium,
• a transfer line for liquid helium for transferring liquid helium from the storage dewar into the application cryostat, comprising a first transfer line end arranged in the storage dewar and a second transfer line end for insertion into the application cryostat,
• an apparatus for generating a pressure difference between the storage dewar and the application cryostat,
• a condensation heat exchanger for condensing helium gas to liquid helium, for insertion into the application cryostat,
• a cryocooler for cooling the condensation heat exchanger, and
• a control apparatus having at least one measuring input from a cryostat pressure sensor for measuring a gas pressure in the application cryostat and a control output to the apparatus for generating a pressure difference, the control apparatus being programmed to control the apparatus for generating a pressure difference such that a volume of liquid helium transferred through the transfer line per unit of time is approximately equal to a change in volume of the helium which condenses from helium gas to liquid helium per unit of time at the condensation heat exchanger.