Filament-size dependent critical current of multifilamentary Nb 3 Sn conductors

The critical current densityj\min{c}\max{ov}of multifilamentary Nb3Sn conductors depends on the diameter of the filaments. At low fields (less than about 12 T)j\min{c}\max{ov}increases with decreasing filament diameter because of the finer grain size. At high fieldsj\min{c}\max{ov}increases with increasing filament diameter. Measurements of the critical current under externally applied tensile str...