| Autor: |
Pienkos, J. E., Douine, B., Leveque, J., Masson, P. J., Luongo, C. A. |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 3/3/2008, Vol. 986 Issue 1, p535-542, 8p, 1 Color Photograph, 3 Diagrams, 5 Graphs |
| Abstrakt: |
Development of bulk YBCO plates has lead to the availability of high performance trapped flux magnets (TFM) enabling power applications such as magnetic bearings, rotating machinery, and fault current limiters. Today, more than 2 T can be trapped at 77 K. Electro-thermal stability of TFM is paramount to achieve reasonable reliability of power devices. We propose to investigate experimentally the stability of trapped flux in single crystal bulk YBCO plates at different operating temperatures. Modifications of the trapped flux magnitude after energy was transferred through a thermal disturbance are monitored. Magnetic and thermal measurements via Hall Probes and an RTD, respectively, were used to study the thermal-magnetic effects of forced instability at various operating temperatures. Instabilities were observed in the form of partial quench of the superconductor, flux jumps and decrease of the trapped flux. The experiments showed a temperature range of high stability for YBCO bulk elements when no relaxation is performed. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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