PURPOSE:To correct deterioration in magnetic field nonuniformity due to magnetic field disturbance by providing annular ferromagnetic bodies adjacently outside of the in-cylinder static magnetic field generation space of a magnet and at right angles to the magnetic field direction. CONSTITUTION:A DC current is supplied to four electromagnets 10-40 which constitute a normal conductive magnet to produce a magnetic field in the internal space of the coils 10-40. A pipe (bobbin) 80 made of epoxy resin, etc., is provided in the coils 20 and 30, bobbins 110 and 120 made of aluminum are fixed to the coils 10 and 40 outside the station magnetic field established by the coils 10 and 40, and silicon steel belts 90 and 100 are wound and adhered fixedly around the bobbins 110 and 120. Consequently, the term of Z2 of magnetic field nonuniformity is corrected.
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