Abstract
60 Hz losses were measured at 4.2 K in a number of Nb 3 Sn rods and tapes produced by the bronze-diffusion process and in commercial Nb 3 Sn tapes. At low fields ( \lsim900 Oe), losses vary by more than two orders of magnitude among the different samples and are related to surface topography. At high fields (≳2 kOe) the variation among samples is much less, and depends mainly on the bulk critical current density J c . The losses are analyzed quantitatively in terms of the critical state model, including a surface current.
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