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. 2015 Jul 17;5:12200. doi: 10.1038/srep12200

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(A) Schematic diagram of the bore of the superconducting magnet together with three axially magnetized, rectangular cross section permanent magnet rings. The green color represents the fact that the ring magnetizations are parallel to the magnetic field of the superconducting magnet. (B) Magnetic field profiles without (red dashed curve) and with (blue plain curve) the compensation from the three rings. The red curve comes from the interpolation of measured data from an 11.7 T wide bore magnet, while the blue curve is calculated assuming perfectly uniform magnetization inside each ring. Here, a first order compensation was realized to provide three sweet spots in the stray field of the superconducting magnet. The z coordinate corresponds to the distance from the center of the superconducting magnet.