Patent ID: 7474099
Filing Date: 2009-01-06
Classification: F25B,F25D,G01R

Abstract:
1. An NMR apparatus for investigation of a sample, the apparatus comprising: a cryostat defining a room temperature bore and having a first cryocontainer installed within an evacuated outer jacket, said cryostat also having at least one radiation shield and/or a further cryocontainer and at least one suspension tube; an NMR probe head disposed in said room temperature bore, said probe head having an RF resonator for receiving NMR signals from the sample as well as a preamplifier for amplifying said NMR signals; an NMR magnet system disposed in said first cryocontainer; a cooling device for cooling said probe head, said first cryocontainer, said radiation shield, and/or said further cryocontainer, said cooling device having a compressor-operated cold head of a cryocooler with several cold stages at differing temperatures; a separate, evacuated and thermally insulated housing in which said cooling device is disposed, said housing positioned directly above said cryostat; at least one cooling circuit having a refrigerant and communicating between said cooling device and said NMR probe head, said cooling circuit driven by said cooling device compressor or via a pump; an at least partially thermally insulated transfer line for passing said refrigerant; and at least one heat-transferring device connected to at least one cold stage of said cold head in a thermally conducting fashion, said heat-transferring device being directly inserted and proximate to one said suspension tube and/or contacts said radiation shield.