Patent ID: 7154271

Claim:
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 the sample therein which is energized by a magnetic field generated by the split type superconducting magnet; and a solenoid coil configured for detecting signals due to magnetic resonance from the energized sample; and a permanent current switch configured for holding the split type superconducting magnet in 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 plurality of 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 a 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; 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.