Siemens Corporation

Nicholas John Clayton

Neil Charles Tigwell

Stephen Paul Trowell

Edgar Charles Malcolm Rayner

Richard Gowland

A cryostat has a cryogen vessel retained within an outer vacuum container, the cryogen vessel being provided with a vent path allowing cryogen gas to escape from the cryogen vessel, the cryostat further having a thermal radiation shield interposed between the cryogen vessel and the outer vacuum container. The vent path is arranged such that escaping cryogen gas is directed through a conduit, which forms an integral part of a thermal radiation shield.

Cryostat radiation shield with joining conduit supplied with vented cryogen gas

The present invention provides a cryostat comprising a cryogen vessel (), a thermal radiation shield (), and a sleeve () for accommodating a cryogenic refrigerator. Also provided is a first thermal contact for thermally and mechanically connecting a first stage of a cryogenic refrigerator to the radiation shield for cooling thereof. A secondary recondensing chamber is provided () for accommodating a second stage of a cryogenic refrigerator, and means () are provided for thermally connecting the secondary recondensing chamber to a recondensing surface () exposed to the interior of the cryogen vessel. The cryostat further comprises a pressure control arrangement () for controlling the pressure of a gas within the secondary recondensing chamber.

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Oxford, United Kingdom

Nicholas John Clayton