Superconductivity - Residual resistance ratio measurement. Residual resistance ratio of Nb₃Sn composite superconductors1 Scope This part of IEC 61788 covers a test method for the determination of the residual resistance ratio (RRR) of Nb3Sn composite superconductors. This method is intended for use with superconductor specimens that have a monolithic structure with rectangular or round cross section, RRR less than 350 and cross sectional area less than 3 mm2, and have received a reaction heat treatment. Ideally, it is intended that the specimens be as straight as

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Annexes to the standard include guidance on the reinstatement of flag and slab areas and recommended typical layouts

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Activities such as quality planning

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8 Factory production control

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