Cooling device with cryostat and cold head having reduced mechanical coupling

摘要

A cooling device 20 comprises a cryostat 23 and a cold head 1, the cryostat 23 comprises a vacuum container 4 with a vacuum container wall 4a and a cryocontainer 2 suitable for holding a cryogenic liquid or gas. The cryocontainer 2 has a wall 2c and is arranged inside the vacuum container 4. A room temperature part 1a of the cold head 1 is mounted to the vacuum container wall 4a with vibration-damping decoupling elements 5. A cooling arm 1b of the cold head 1 projects into an access opening 13 of cryocontainer 2 along a longitudinal axis LA. A flexible sealing section 6 connects the vacuum container wall 4a directly or indirectly to the room temperature part 1a of the cold head 1and seals off the inside of the cryocontainer 2 from the environment. The device may contain a radiation shield 3 between the vacuum container wall 4a and the cryocontainer wall 2c. The decoupling elements 5 may be negative-stiffness isolating elements. The device is particularly suited for use with a pulse tube cooler for recording NMR spectra.