Effects of soldering void on recovery characteristics of a cryostable superconductor

A conductor for a cryostable magnet is usually made by soldering a superconducting matrix to an OFHC copper strip. The presence of voids between the matrix and the stabilizer due to the imperfection in the soldering bond is of great concern to magnet designers. An experiment was set up to investigage the effect of the void on the characteristics of hot end recovery and cold end recovery for CFFF superconductors. Tests were made on samples having different lengths of soldering void under various magnetic field strengths and injecting energies. The recovery current and the temperature distributions along the matrix and the copper stabilizer were mentioned. The test results are presented.