Skip to Main Content
Magneto-optical current reconstruction has been used for detailed analysis of the local critical current density (Jc) variation in monocore Bi-2223 tapes. We find, even in high quality tapes with bulk transport jc∼40 kA/cm2 (77 K, 0 T), that there exist local regions which possess current densities of more than 200 kA/cm2. Overpressure processing at 148 bar significantly improved Jc to 48 kA/cm2 by improving the connectivity. For the overpressure-processed sample we find that the current distribution is more uniform and that the maximum local current density at 77 K is increased almost to 300 kA/cm2.