NMR magnet device for solution analysis and NMR apparatus

A superconducting magnet device configured for an NMR spectrometer, which comprises;

• a split type superconducting magnet comprising left solenoid superconducting magnets and right solenoid superconducting magnets, the split type superconducting magnet having a center space around a vertical center axis between the left solenoid superconducting magnets and the right solenoid superconducting magnets;
• a sample tube placed in the center space in order to enable placement of a sample therein which is energized by the magnetic field generated by the split type superconducting magnet;
• a solenoid coil configured for detecting signals due to magnetic resonance from the energized sample, and
• a permanent current switch for holding the split type superconducting magnet to a permanent current mode;
• wherein the left solenoid superconducting magnets and the right solenoid superconducting magnets are arranged mirror-symmetrically with respect to a center face along the vertical center axis;
• wherein the left solenoid superconducting magnets and the right solenoid superconducting magnets are constituted respectively by a separate plurality of outermost magnets and a separate plurality of innermost magnets;
• wherein the plurality of innermost magnets are sandwiched between the outermost magnets;
• wherein the plurality of innermost magnets are constituted by a plurality of split type solenoid coils and are arranged mirror-symmetrically with respect to the center face thereof;
• wherein the left solenoid superconducting magnets and the right solenoid superconducting magnets are arranged symmetrically with respect to the horizontal center axis intersecting the vertical center axis;
• wherein the left solenoid superconducting magnets and the right solenoid superconducting magnets are arranged in concentric relation with respect to the horizontal center axis;
• and
• wherein a direction of current in at least one of the plurality of innermost magnets is minus when a direction of main current in at least one of the plurality of outermost magnets configured for energizing the sample is plus.