| http://www.w3.org/ns/prov#value | - Because the shield coil 16C is added in such a manner as to cover the opposed surface of the outer peripheral portion of the cooling container 12 of the superconducting magnet 11, shield can be effected up to the area of the conductor existing at the outer peripheral portion of the superconducting magnet 11, and the restriction effect of the eddy current resulting from the leakage magnetic field c
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