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Low temperature Joule-Thomson UHV Cryostat for SPM applications

In cooperation with the research group of Prof. Wulfhekel (University of Karlsruhe – Germany) a new type of UHV compatible SPM low temperature cryostat has been developed.
The new design is based on CryoVac’s very successful and well established UHV SPM bath cryostat which is used in various OEM systems.

The new system consists of a three stage UHV cryostat:

20 litre LN₂ bath cryostat with a heat load of about 8 W at 77 K and a hold time of the LN₂ system of about 100 hours
10 litre L⁴He bath cryostat with a heat load of about 35 mW at 4.2 K and a hold time of the L⁴He system of more than 150 hours
close cycle Joule-Thomson cryostat system with either ⁴He or ³He operation

The system is designed for ⁴He and ³He operation, respectively. In ⁴He operation the guaranteed operation temperature is below 2 K and the reachable base temperature even slightly below 1 K.
In the optional upgradable 3He operation mode base temperature as low as 500 mK can be reached. In this mode the ³He throughput is about 3 litre gas per hours which leads to a cooling power of about 1 mW.

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