Spectrospin Ag

Silvio Di Nardo

Rene Jeker

Beat Mraz

A NMR measurement apparatus comprising a cryostat (10) in which a superconducting magnet coil system (9) is disposed in a first tank (8) having cryogenic liquid and surrounded by additional cooling devices such as radiation shields (5, 6), superinsulating foil (7) and, if appropriate, a second tank (3) having cryogenic liquid, is characterized by a pulse tube cooler (11) cryotechnically connected to at least one of the additional cooling devices in a good heat conducting fashion with this cooling device being mechanically attached in the cryostat (10) in such a fashion that vibrational and cryotechnical decoupling is achieved between the cooling device and the first tank (8) having the cryogenic liquid and, in particular, between the cooling device and the superconducting magnet coil system (9). The cooling losses of the cryostat are minimized in the NMR measurement apparatus in accordance with the invention so that a nearly uninterrupted operation of the apparatus is facilitated with, however, no field distortions being produced by the cryogenic measures, which would be extremely undesirable, in particular, with a high resolution NMR spectrometer and which would have to be compensated for through extremely difficult technical measures.

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Zurich, Switzerland

Silvio Di Nardo