Magnetization method for long high-T/sub c/ bulk superconductors used for magnetic separation
| Autor: | Noriyo Nishijima, Masato Murakami, Norihide Saho, K. Tsutsumi, Hidemi Hayashi, Katsuhiko Asano |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Superconductivity
Materials science High-temperature superconductivity Condensed matter physics Magnetic separation Superconducting magnet Condensed Matter Physics Magnetic flux Computer Science::Other Electronic Optical and Magnetic Materials law.invention Magnetic field Magnetization law Magnet Electrical and Electronic Engineering |
| Zdroj: | IEEE Transactions on Appiled Superconductivity. 13:1580-1583 |
| ISSN: | 1051-8223 |
| DOI: | 10.1109/tasc.2003.812794 |
| Popis: | We have developed a new water-treatment system consisting of a membrane separator and a magnetic separator that uses long (>200 mm) high-temperature bulk superconductors (SCs) as permanent magnets. For magnetizing the long bulk SCs, we developed a new magnetization method. Namely, a field is applied, the bulk SCs are cooled below their transition temperature (T/sub c/), and during cooling, the bulk SCs are inserted into and withdrawn from the applied field repeatedly. As a result, the bulk SCs experience high and low fields under a gradually cooled ambient, and the trapped field gradually increases. The benefit of this method is that it can magnetize large bulk SCs by using a small field magnet. We fabricated an embedded-SC bulk magnet more than 200-mm long, and magnetized it by split-solenoid superconducting magnets with a diameter of approximately 100 mm. Field measurements showed that the developed method can magnetize a wider area over the bulk SCs than that possible with a conventional field-cooling method. |
| Databáze: | OpenAIRE |
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