Patent ID: 7049913

Claim:
A superconductivity magnet apparatus comprising: a split-type electromagnet including two superconductivity coil blocks having respective coils made by winding a superconductivity wire around each bobbin, wherein said superconductivity coil blocks are placed so as to face each other having the gap between said superconductivity coil blocks in the axial direction of a magnetic field generated by said coils; a support structure body provided at said gap to support an electromagnetic force working between said superconductivity coil blocks, and made of a material having a relative magnetic permeability in the range 1.000 to 1.002; a refrigerant container for cooling said split-type electromagnet to keep said coils in a super-conductive state; and an access port for accessing to a measurement space provided at the center of said split-type electromagnet or in the proximity of there through said gap.