The critical current densities of MgB2 monofilamentary strands, with and without SiC additions, were measured at 4.2K. In addition, the magnetic JC at B = 1T was measured from 4.2 to 40K. Various heat treatment times and temperatures were investigated for both short samples and small helical coils. The SiC additions were seen to improve high-field transport JC at 4.2K, but improvements were not evident at 1T at any temperature. The transport results were relatively insensitive to heat-treatment times and temperatures for both short samples and coils in the 700 to 900C range.

Transport and Magnetic JC of MgB2 Strands and Small Helical Coils. M.D.Sumption, M.Bhatia, M.Rindfleisch, M.Tomsic, E.W.Collings: Applied Physics Letters, 2005, 86[10], 102501 (3pp)