“…Much interest has been shown in the improvements achieved with Nb3Sn by doping with small quantities of other metals, such as titanium. Figure 7 compares the current densities versus field for pure and doped Nb;Sn [4] showing a factor of 2 enhancement at 16 tesla and significant usefulness beyond 20 tesla. At the moment, however, these technical possibilities are not fully realised on a commercial scale.…”