Materials for classical and high- superconducting tapes and wires at 4.2 K

Abstract

For the next few years, the classical materials NbTi and will still remain at the centre of interest for the construction of magnets operating at temperatures between 1.8 and 4.2 K. Magnets operating in the persistent mode at fields > 20 T and laboratory magnets approaching 23 T can be envisaged in the near future, based on and wires. The actual situation of critical current densities as a function of the applied field at 4.2 K is briefly reviewed.