CRYOSTAT AND METHOD FOR REDUCING HEAT INPUT INTO A CRYOSTAT

摘要

In a cryostat, in particular for use in a magnetic resonance imaging (MRI) system, and a method for reducing heat input into such a cryostat, an insert is provided that is adapted to be inserted into an opening of the cryostat. The insert is adapted to provide one or more passageways for a cryogen through the opening by defining at least one space between the outer surface of the insert and at least one part of the inner surface of the opening. This space allows the cryogen to pass over the part of the inner surface of the opening.

主权项

1. A cryostat comprising:
a cryostat vessel having an interior that contains a cryostat; a refrigerator interface having an opening therein that communicates with said interior of said cryostat vessel, said opening having an inner surface and a length; an insert having an outer surface that allows said insert to be inserted into said opening to produce at least one passageway for said cryogen through said opening between said outer surface of said insert and at least a portion of said inner surface of said opening with said cryogen passing over said at least one part of said inner surface of said opening; and said outer surface of said insert comprising a plurality of structural elements that define said passageway through said opening and that make said passageway through said opening longer than said length of said opening.