A 25.05 T magnetic field was generated by a 5.11 T superconducting Bi 2 Sr 2 CaCu 2 O x insert magnet within a 19.94 T resistive magnet. The Bi 2 Sr 2 CaCu 2 O x magnet is constructed using fully reacted powder-in-tube conductor and insulated stainless steel reinforcement. Three concentric sections are used to minimize the total stress in the Bi 2 Sr 2 CaCu 2 O x conductor: two double pancake stacks and an outer layer-wound section. The insert coil operates at 4.2 K in a 0.168 m diameter cryostat fitted to the resistive magnet. Here we provide an overview of the design and construction of the insert and the results of self-field and in-field testing. Mechanical and electrical safety issues, related to testing in a large resistive magnet, are discussed.
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Weijers et al. (2004) studied this question.