抄録
R & D for the next generation superconducting magnets of high-energy physics accelerators, MHD generators, SMES, nuclear fusion reactors, and higher resolution NMRs needs advanced superconductors. The conductors of Nb3Al are the possible candidates because of the higher magnetic field properties of critical current density, the excellent critical current density at lower- and medium-field ranges, and the higher strength against mechanical stress. The R & D of jelly-roll processed Nb3Al has given already well-qualified conductors. Newly proposed rapid heat, the rapid quench process for Nb3Al, is also attractive from an economic aspect because of the superconductive characteristics of conductors. However, further developments are needed for the choice of stabilizer metal, cross-section configuration design, insulation materials, reinforcement and impregnant, n-value, joint technology between the two conductor; thus a prompt start of R & D is being requested.
