Engineering considerations for the production of small HT/sub c/ coils for commercial high current applications have been evaluated. Part of this study involved investigations of the conditions under which coils are wound, heat treated and potted in order to reproduce, in lengths exceeding 50 m, the critical current density (J/sub c/) which can be attained in short samples of a few cm in length. Individual pancake coils were evaluated by testing their 4.2 K superconducting current capacity in the presence of an applied magnetic field up to 10 T. The performance of each coil was compared to the J/sub c/ capacity predicted from short sample J/sub c/ testing on samples of a few cm length. Coils were then stacked to form prototype magnets and the field generated by the magnet was measured using a Hall probe.>
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Dai et al. (1995) studied this question.