| US 7,487,644 B2 | ||
| Cryostat assembly | ||
| Philip Alexander Carr, Oxon (United Kingdom); Oleg Kirichek, Oxon (United Kingdom); and Milind Diwakar Atrey, Oxon (United Kingdom) | ||
| Assigned to Oxford Instruments Superconductivity Limited, Oxford (United Kingdom) | ||
| Filed on Nov. 21, 2005, as Appl. No. 11/282,671. | ||
| Claims priority of application No. 0428406.3 (GB), filed on Dec. 24, 2004. | ||
| Prior Publication US 2006/0137363 A1, Jun. 29, 2006 | ||
| Int. Cl. F17C 3/10 (2006.01); F17C 5/02 (2006.01); F25D 19/00 (2006.01) | ||
| U.S. Cl. 62—48.2 [62/47.1; 62/296] | 16 Claims |
| 1. A cryostat, comprising:
a liquid coolant containing vessel;
a pulse-tube refrigerator having at least one cooling stage located above the liquid coolant containing vessel;
a channel for conveying gaseous coolant from the liquid coolant containing vessel to the at least one cooling stage where
the gaseous coolant is condensed in use and then returns through the channel to the liquid coolant containing vessel; and
an acoustic wave attenuator with a cylindrical body in which are formed a plurality of channels arranged in a regular array,
located in the channel for attenuating an acoustic wave originating from the pulse-tube refrigerator and propagating through
the gaseous coolant, while permitting a flow of gaseous coolant to pass to the cooling stage and a flow of condensed coolant
to pass to the liquid coolant containing vessel.
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