Patent ID: 7292040

Claim:
A superconducting magnet 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 between the left solenoid superconducting magnets and the right solenoid superconducting magnets configured for receiving a sample tube; 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 symmetrically with respect to a center face of the center space; wherein the left solenoid superconducting magnets are constituted by an outermost magnet and a plurality of innermost magnets; wherein the right solenoid superconducting magnets are constituted by an outermost magnet and a plurality of innermost magnets; wherein the left solenoid superconducting magnets and the right solenoid superconducting magnets are arranged in concentric relation with respect to a vertical axis of the center space; and wherein a direction of current in at least one of the plurality of innermost magnets is minus when a direction of current in the outermost magnet of at least one of the right and left solenoid superconducting magnets is plus.