Closed cycle refrigerator system from Elliot Scientific Sep 23, 2008

For successful measurements, the isolation of the sample from refrigerator vibrations is critical. To achieve this, a flexible bellows assembly is installed between the refrigerator body and the sample support flange which, in turn, is mounted to an independent table or frame. The flexible bellows dampen vibrations before they reach the sample support with typical line broadening of 0.01 mm/s. The sample support rod is suspended within a copper cylinder (with Mylar windows for maximum gamma transmission) and is cooled indirectly using static helium exchange gas inside the chamber. This arrangement permits samples to be quickly exchanged without warming the entire cryostat. It is also ideal for uniform cooling of poor thermally conducting samples such as foils and powders.

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