Chapter 2.4: Quality Assurance of Bi-2223 Wires

Activity of quality assurance of commercial Bi-2223 wire, Bi, Pb(2223) wire as described in this chapter, is introduced, and the specifications of the spliced wire are proposed. Statistical data and experimental data related to wire specifications are discussed based on the probability theory. Detecting the defects for protection against the quench is a highly important task for Bi, Pb(2223) wire quality assurance. The method of electrical inspection such as critical current I_c and n-value is explained. For inspecting the uniformity of the wire, the hall probe measurement method has been developed. Uniformity of the critical current of Bi, Pb (2223) is discussed.