Thermometric measurements of the self-field losses in silver sheathed PbBi2223 multifilamentary tapes

摘要: Self-field ac losses in Ag sheathed PbBi-2223 tapes were measured using a thermometric method, which determines the by measuring temperature profile of vacuum insulated sample, with both ends at fixed temperature. In practice, samples placed capsule immersed LIN bath. By minimizing bath superheat, thermal emf and heating current contacts, loss induced increase as low 2 mK was Si diode thermometer. With typical sample length 600 mm, self-held between 7/spl times/10/sup -6/ W/m 4/spl -3/ different frequencies. The results are good agreement electric measurement theoretical calculation. This provides first independent confirmation that carefully voltage loops can give true sample.