| 摘要 |
PROBLEM TO BE SOLVED: To provide a cryostat easy to reduce in size and weight. SOLUTION: The cryostat includes an approximately hermetically structured low temperature vessel 3 in which an extremely low temperature liquid 4 for cooling an object 6 to be cooled is stored, a vacuum vessel 2 for forming a vacuum and heat-insulated space 12 around the vessel 3, and an external through-pipe 5 having both ends supported on the vessel 3 and provided in the vicinity of the object 6. A diaphragm 3d for absorbing a difference in thermal expansions between the pipe 5 and the vessel 3 is formed on the support of the vessel 3 for supporting the external through-pipe 5. Since the diaphragm 3d absorbs the difference in thermal expansions between the pipe 5 and the vessel 3, distortion or stress can be prevented from occurring on the support of the vessel 3. In addition, since bellows protruding out of the vessel 3 can be eliminated, the vacuum vessel 2 for storing the low temperature vessel 3 can be downsized, thereby reducing size and weight of the entire cryostat. COPYRIGHT: (C)2007,JPO&INPIT |
