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Superconducting shim system with high purity magnetic field for NMR and MRI solenoid magnet MIDI-200

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3 Author(s)
Konzbul, P. ; Inst. of Sci. Instrum., Acad. of Sci., Brno, Czech Republic ; Sveda, K. ; Srnka, A.

The superconducting shim system with a high purity magnetic field for the NMR and MRI solenoid magnet MIDI-200 (Bmax=5 T, room temperature bore 200 mm) has been designed and constructed. The system is formed by 9 fundamental shims and is positioned on a cylindrical duralumin former. The method of designing shims makes use of recursion expressions for coefficients of particular spherical harmonics in which the field of a specific current bearing conductor can be expanded. In conclusion, the theoretical configurations of correcting fields and those measured on a cylinder or spherical area are compared by the magnetic field analysis

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Magnetics, IEEE Transactions on  (Volume:32 ,  Issue: 4 )