| 摘要 |
An arrangement for mounting a two stage cryogenic refrigerator (17) into a cryostat, the arrangement comprising a vacuum sock (15) for accommodating at least a part of the refrigerator, attachment means (32, 34) for attaching an upper part of the refrigerator to a surface (14) of the cryostat around an opening of the vacuum sock, a thermally conductive portion (26) of a wall of the vacuum sock which, in use, is thermally and mechanically in contact with a second cooling stage (24) of the refrigerator, and arrangements (40, 42) are provided for thermally connecting a first stage (22) of the refrigerator to a thermal radiation shield (16) of the cryostat. The said arrangements comprise a bellows structure (40) which is in a retracted position when the vacuum sock is at atmospheric pressure, and which is in an extended position when the sock is under vacuum, wherein in its extended position, the bellows presses a thermally conductive contact piece (42) into thermal and mechanical contact with a first cooling stage (22) of the refrigerator. |
