NMR magnet device for solution analysis and NMR apparatus

Abstract

The split type magnet device for high-sensitivity NMR apparatus to be used for solution analysis of the present invention provides a direction which generates a remarkably uniform magnetic field at the center portion of the magnet device used for determining the sample. The magnet device for NMR apparatus comprises first multilayer coils and second multilayer coils which face to each other with a predetermined distance being provided therebetween, each of pairs of the first and the second coils being substantially coaxial with respect to a central axis, each of layers of each of the first and the second multilayer coils having at least one coil, wherein an energizing current of at least one of the coils constituting an innermost layer of each of the first and the second multilayer coils is in a minus direction if an energizing current of the coil used for generating a main magnetic field for NMR detection in the vicinity of a center portion of the apparatus is in a plus direction.

What is claimed is:  
     
         1 . A magnet device for NMR apparatus, comprising: first multilayer coils and second multilayer coils which face to each other with a predetermined distance being provided therebetween, each of pairs of the first and the second multilayer coils being substantially coaxial with respect to a central axis, each of layers of each of the first and the second multilayer coils having at least one coil, 
 wherein an energizing current of at least one of the coils constituting an innermost layer of each of the first and the second multilayer coils is in a minus direction if an energizing current of the coil used for generating a main magnetic field for NMR detection in the vicinity of a center portion of the apparatus is in a plus direction.    
     
     
         2 . The magnet device for NMR apparatus according to  claim 1 , wherein an energizing current of at least one of the coils constituting layers other than the innermost layers of the first and the second multilayer coils is in a minus direction.  
     
     
         3 . The magnet device for NMR apparatus according to  claim 1 , wherein only the innermost layer of each of the first and the second multilayer coils is formed of a plurality of coils.  
     
     
         4 . The magnet device for NMR apparatus according to  claim 1 , wherein only the innermost layer and a layer or layers placed radially outward from the innermost layer of each of the first and the second multilayer coils are respectively formed of a plurality of coils.  
     
     
         5 . The magnet device for NMR apparatus according to  claim 1 , wherein the first multilayer coils and the second multilayer coils are arranged mirror-symmetrically with each other.  
     
     
         6 . The magnet device for NMR apparatus according to  claim 1 , further comprising a shield coil for shielding a leakage magnetic field or a ferromagnetic member for shielding a leakage magnetic field.  
     
     
         7 . The magnet device for NMR apparatus according to  claim 6 , further comprising a cylindrical ferromagnetic member and a shield coil.  
     
     
         8 . The magnet device for NMR apparatus according to  claim 6 , further comprising a disk-like ferromagnetic member and a shield coil.  
     
     
         9 . The magnet device for NMR apparatus according to  claim 1 , wherein each of the coils comprises a substance having superconductivity such that the magnetic device is capable of cooling the coils to or below temperatures at which the coils exhibit the superconductivity.  
     
     
         10 . An NMR apparatus comprising the magnet device for NMR apparatus of  claim 1.