Patent ID: 9494344
Filing Date: 2016-11-15
CPC Classification: F17C,F25B,F25D,G01R,H01F

Claim Text:
1. A method for converting a cryostat configuration having a room temperature vacuum container housing a first container structured for holding a liquid helium bath at an operating temperature which is kept below 5K by means of helium evaporation, wherein the room temperature vacuum container also contains a second container structured to hold liquid nitrogen for thermally shielding the first container and to keep that liquid nitrogen at an operating temperature of between 75 and 80K by means of nitrogen evaporation, the method comprising the steps of: a) introducing a fluid cooling medium into the second container, the fluid cooling medium being gaseous at a temperature of 60K and a pressure of 1 bar; and b) cooling the cooling medium to an operating temperature of ≦60K using a refrigerator and a cooling circuit, the cooling circuit having coolant lines which are guided into the second container.