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International Journal of High-Energy Physics

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4 K Crycooler with Sample in Exchange Gas Jul 20, 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.

These advantages 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 by simply 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 as compared with sample in vacuum cryostats.

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