Abstract
We have developed a new configuration for a high-sensitivity NMR spectrometer, using a superconducting split magnet and a room temperature cross-bore. To achieve higher sensitivity, we selected a solenoid-shaped probe coil; the split-magnet system was adopted to get around the complex probe in the structure. The superconducting split magnet is divided into two multilayer coils, and the vertical bore is located between them. A sample tube is inserted into the vertical bore and a probe system is inserted into the horizontal bore. We have already fabricated these magnet systems in the 300MHz and 600MHz resonance frequency-classes. The systems are composed of a superconducting split magnet for the main field, with superconducting shim coils located inside and outside the split magnet. The 600MHz system has run for more than 13 months with less than 1Hz/h field drift. Recent results showed that the signal to noise ratio of a correlation sample (0.1% ethyl benzene) was 4523 for the 600MHz system with a cryogenic probe system.
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