This part of IEC 61788 covers a test method for the determination of the residual resistance ratio (RRR) of Nb3Sn composite conductors. This method is intended for use with superconductor specimens that have a monolithic structure with a rectangular or round cross section, RRR less than 350 and cross-sectional area less than 3 mm, and have received a reaction heat-treatment. Ideally, it is intended that the specimens are as straight as possible; however, this is not always the case, thus care must be taken to measure the specimen in its as received condition. All measurements are done without an applied magnetic field.
The method described in the body of this standard is the "reference" method; optional acquisition methods are outlined in Annex A.
BS EN 61788-11:2003 history
2011BS EN 61788-11:2011 Superconductivity. Residual resistance ratio Measurement. Residual resistance ratio of Nb3Sn composite superconductors
2003BS EN 61788-11:2003 Superconductivity - Residual resistance ratio measurement - Residual resistance ratio of Nb3Sn composite superconductors