Flux Creep in Multifilamentary Conductors of NbTi and Nb3Sn

摘要

Long term decay of the sextupole field has been observed in accelerator dipole magnets, and this effect has been linked to ''flux creep'' in the superconductor. To study this problem, the decay of the magnetization of multifilamentary conductors of NbTi and Nb3Sn have been measured as a function of time. Measurements show that as a function of ln(ital t) this decay cannot always be characterized by a single decay rate. Long time decay rates are sometimes approximately half that which is observed at short times