The current distribution in a striated YBCO tape subjected to both a magnetization and atransport current

Abstract

In this work we have quantified the results concerning the currentdistribution and the values of the full magnetization currentIf during a complete cycle of an externally applied magnetic field,Bext.A YBa2Cu3O7−x-coated conductor in the form of a striated tape 12 mm wide and 100 mm long, withunstriated ends, was exposed to a gradually changing external magnetic field. For everyselected phase of the initial cycle of the magnetic field (first cycle after cool-down), theperpendicular component of the self-field profile over the center of the tape was measured.The Tikhonov method of regularization was used in the inverse calculation of the currentdistribution. For every quarter of the cycle the magnetization current distribution profilescorresponding to different levels of gradually changing external magnetic fieldBext were plotted. After finishing the whole cycle, the external magnetic field was eliminatedupon returning to a zero level and the gradual ramping of a transport current wascommenced. The change in current distribution because of the increasing transportcurrent took place only in the non-saturated half-width of the tape current profile.