Improved critical currents in a Bi-2223/Ag coil using splayed columnar defects
| Autor: | J. L. Ullmann, J. O. Willis, M. P. Maley, J.Y. Coulter |
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| Rok vydání: | 2004 |
| Předmět: |
Superconductivity
Yield (engineering) Flux pinning Materials science Condensed matter physics Energy Engineering and Power Technology Condensed Matter Physics Power law Electronic Optical and Magnetic Materials Magnetic field Core (optical fiber) Electromagnetic coil Condensed Matter::Superconductivity Magnet Electrical and Electronic Engineering |
| Zdroj: | Physica C: Superconductivity. :1079-1084 |
| ISSN: | 0921-4534 |
| DOI: | 10.1016/j.physc.2004.01.115 |
| Popis: | 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 Ic 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 Ic 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. |
| Databáze: | OpenAIRE |
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