Abstract
We have irradiated a double pancake coil of Bi-2223/Ag sheathed tape with high energy protons, which yield splayed columnar defects in the superconductor core of the tape. We report the critical current I c and current–voltage power law n value as a function of magnetic field at temperatures of 75–64 K for the coil and for a short sample taken from the coil. A novel apparatus using permanent magnets is used to apply a magnetic field in the coil radial direction. Both the coil and short sample show a strong enhancement in I c for magnetic fields along the c axis (tape normal or radial direction for the coil) compared to the performance of unirradiated tape. These results represent the first time a real superconducting device has been irradiated with high energy protons for the purpose of introducing splayed columnar defects to enhance performance.
Published Version
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