Damage caused by magnetic pressure at high trapped field in quasi-permanent magnets composed of melt-textured YBaCuO superconductor
| Autor: | C.C. Foster, Y.T. Ren, R. Sawh, Jiarui Liu, Roy Weinstein |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
Superconductivity
Materials science Field (physics) Condensed matter physics Energy Engineering and Power Technology Fracture mechanics Condensed Matter Physics Electronic Optical and Magnetic Materials Magnetic field Cracking Magnet Magnetic pressure Electrical and Electronic Engineering Current density |
| Zdroj: | Physica C: Superconductivity. 251:15-26 |
| ISSN: | 0921-4534 |
| DOI: | 10.1016/0921-4534(95)00398-3 |
| Popis: | Quasi-permanent magnets made of melt-textured YBa2Cu3O7 - delta (MT-YBCO) superconductor can now trap multi-tesla fields, B sub t. The interaction of the trapped field and the critical current causes an outward pressure, proportional to B sub t (2), which can crack the magnet. The authors have done an experiment to observe such cracking in a mini-magnet fabricated from four MT-YBCO discs activated at 49 K using an applied field of 14 T. They have compared the results to existing theories which describe magnetic pressure in a trapped-field magnet (TFM) previously activated. They find that a modification is needed to describe magnetic pressure during the process of activation. They present the experimental results and the expanded theory, based on the simple Bean model. Theory and experiment show good agreement. The authors find that cracking is more likely during activation, and conclude that 10 T is achievable in TFM`s composed of present materials. Cracking is most probable at the center of a TFM, with the cracks running radially outward. |
| Databáze: | OpenAIRE |
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