On the reduction of flux creep in superconducting accelerator magnets

The authors have performed intensive studies on flux creep in high-T/sub c/ superconductors and on M transition curves inside the hysteresis area and were able to reduce dM/d ln t at a given B by an order of magnitude by appropriate previous magnetic field cycling. The reduction can be explained by the critical state model. As this model applies both to the high-T/sub c/ and to technical 4-K superconductors, the authors' dM/d ln t reduction method can be applied also to NbTi or Nb/sub 3/Sn superconductors for accelerator magnets.