Nb3Al AND Nb3(Al,Ge) SUPERCONDUCTING TAPES BY LASER BEAM ANNEALING |
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Authors: | H Kumakura K Togano Y Yamada S Murase |
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Affiliation: |
a National Research Institute for Metals, Tsukuba-City, Ibaraki, Japan
b Toshiba R&D Center, Kawasaki, Japan |
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Abstract: | Nb3Al AND Nb3(Al,Ge) tapes with excellent superconducting properties have been fabricated using high energy density laser beam irradiation, irradiations were carried out continuously on Nb-25at%AI and Nb-20at%Al -5at%Ge tapes prepared by powder metallurgical processing. With the high power density and short irradiation time, the tape could be heated and cooled much faster than a tape heat treated by conventional methods. The results were fine structure and large critical current density Jc values at high magnetic fields. Jc at 23 Tesla was over 104 A/cm2. This value was much greater than that obtained from a commercial Nb3Sn superconductor. New continuous irradiation systems have been developed for scale-up development. Nb3Al tapes 10 m in length were successfully fabricated. There was some scatter in Jc along the tape length. Small coil tests in magnetic fields indicated that the tape had excellent stability against a flux jump and mechanical strain. |
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