The Influence of Ex Situ MgB₂Barrier and HIP on the I_cAnisotropy in Double Core MgB₂/Cu Wires

Abstract

The effect of large I c anisotropy reductions in MgB 2 /Cu sheathed wire is presented. The measurements of the critical current in rising magnetic field up to 14 T at 4.2 K were performed. Due to the application of the high isostatic pressure process to the copper sheathed MgB 2 wires with the ex situ MgB 2 homo barrier around the in situ core the anisotropy for such wires was very small and approached to less than 2% at magnetic field over 4 T. The presented geometry and technology show several advantages in their practical applications.

The electric field jump—detection of damaged Nb barrier in MgB2wires annealed under pressure

“…The studies presented by Hossain et al, Li et al, and Gajda et al showed that the value of critical current has the same value for the short and long samples [12][13][14]. Critical current measurements were made in the International Laboratory of High Magnetic Fields and Low Temperatures in Wroclaw [12,15]. Our studies were performed on MgB 2 wires obtained from Institute of High Pressure PAS and Hyper Tech Research, Inc. [16,17]).…”