초록 ▼

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

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.

대표청구항 ▼

[ We claim:] [1.] A high resolution nuclear magnetic resonance (NMR) measurement apparatus comprising:a low loss cryostat;a first tank disposed inside said cryostat, said first tank for containing cryogenic liquid;a superconducting magnetic coil system disposed in said first tank for cooling by said

[ We claim:] [1.] A high resolution nuclear magnetic resonance (NMR) measurement apparatus comprising:a low loss cryostat;a first tank disposed inside said cryostat, said first tank for containing cryogenic liquid;a superconducting magnetic coil system disposed in said first tank for cooling by said cryogenic liquid, said superconducting magnet coil producing an extremely homogeneous magnet field for high resolution NMR spectroscopy;a second tank disposed inside said cryostat and surrounding said first tank, said second tank mechanically mounted in said cryostat to vibrationally and cryogenically decouple said second tank from said first tank and from said superconducting magnet coil system, said second tank containing at least one of liquid nitrogen, said nitrogen, liquid air, solid air, liquid oxygen, solid oxygen, liquid neon and liquid argon; anda pulse tube cooler having a cold end cryogenically thermally coupled to said second tank.