Refrigerated penetration insert for cryostat with rotating thermal disconnect
First Claim
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1. An interface for a horizontal cryostat penetration insert for coupling a cryogenic refrigerator cold end to the cryostat penetration insert, said insert having an outer housing and a thermal radiation shield, said cryogenic refrigerator cold end having at least one stage, said interface comprising:
- an extension of said outer housing providing access to the interior of said housing;
an extension of said thermal radiation shield into said housing extension;
a first thermal contact means affixed to the end of said thermal radiation shield extension, said first thermal contact means defining a central aperture and providing heat conduction between said shield extension and said first contact;
a second thermal contact affixed to the stage of the cryogenic refrigerator cold end to provide heat conduction from the second thermal contact means to the cryogenic refrigerator stage;
means for rotatably mounting the stage of cold end refrigerator in the housing extension, said second thermal contact means situated in the central aperture defined by said first thermal contact means; and
means for rotating the cold end refrigerator to bring said first and second thermal contact means into and out of contact with one another.
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Abstract
A rotating refrigerator connection is provided which allows field interruption of the heat conduction path between a one, two or three stage cryogenic refrigerator and a cryostat in the event of a refrigerator failure or scheduled service.
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Citations
6 Claims
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1. An interface for a horizontal cryostat penetration insert for coupling a cryogenic refrigerator cold end to the cryostat penetration insert, said insert having an outer housing and a thermal radiation shield, said cryogenic refrigerator cold end having at least one stage, said interface comprising:
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an extension of said outer housing providing access to the interior of said housing; an extension of said thermal radiation shield into said housing extension; a first thermal contact means affixed to the end of said thermal radiation shield extension, said first thermal contact means defining a central aperture and providing heat conduction between said shield extension and said first contact; a second thermal contact affixed to the stage of the cryogenic refrigerator cold end to provide heat conduction from the second thermal contact means to the cryogenic refrigerator stage; means for rotatably mounting the stage of cold end refrigerator in the housing extension, said second thermal contact means situated in the central aperture defined by said first thermal contact means; and means for rotating the cold end refrigerator to bring said first and second thermal contact means into and out of contact with one another. - View Dependent Claims (2, 3, 4, 5)
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6. An interface with an automatic disconnect for a horizontal cryostat penetration insert for coupling a cryogenic refrigerator cold end to the cryostat penetration insert, said insert having an outer housing and a thermal radiation shield, said cryogenic refrigerator cold end having at least one stage, said interface comprising:
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an extension of said outer housing providing access to the interior of said housing; an extension of said thermal radiation shield into said housing extension; a first thermal contact means affixed to the end of said thermal radiation shield extension, providing heat conduction between said shield extension and said first contact; a second thermal contact affixed to the stage of the cryogenic refrigerator cold end to provide heat conduction from the second thermal contact means to the cryogenic refrigerator stage; means for mounting the stage of cold end refrigerator in the housing extension, said second thermal contact means situated in thermal contact with said first thermal contact means; and means for moving the cold end refrigerator to bring said first and second thermal contact means into and out of contact with one another said means comprising a hydraulic double-acting cylinder actuator having two ports for receiving the compressed gas supplied to the refrigerator cold end and the return gas, respectively, the pressure differential and lack of differential capable of moving said cold end to bring said first and second thermal contact means into and out of contact, respectively.
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Specification