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International Journal of High-Energy Physics

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10 K Cryocoolers with Sample in Exchange Gas Jul 7, 2010

Janis exchange gas systems offer rapid sample exchange while the refrigerator is operating, and efficient cooling for non-conductive or irregularly shaped samples not easily clamped to a cold finger.

Please visit http://www.janis.com/10KCryocoolerSampleInExchangeGasCERNCourier.aspx for more information on Janis 10 K Cryocoolers with sample in exchange gas, including mechanical drawings and specifications.
The advantages mentioned above are made possible by using the refrigerator to cool a column of helium exchange gas surrounding the sample. The sample is inserted, via a long rod, into a nearly isothermal region of the gas column for cooling. Sample exchange simply consists of removing the sample rod, switching samples on the rod, and reinserting the rod into the cryostat. The entire sequence takes only a matter of minutes and is performed while the refrigerator is operating. Thus the time to cool successive samples is greatly reduced over cold finger cryostats.