Magnetization method for long high-Tc bulk superconductors used for magnetic separation

Noriyo Nishijima, Norihide Saho, Katsuhiko Asano, Hidemi Hayashi, Katsuya Tsutsumi, Masato Murakami

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

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the bulk SCs are cooled below their transition temperature (Tc), and during cooling, the bulk SCs are inserted into and withdrawn from the applied field repeatedly.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.

Original languageEnglish
Pages (from-to)1580-1583
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume13
Issue number2 II
DOIs
Publication statusPublished - 2003 Jun
Externally publishedYes

Fingerprint

Magnetic separation
Superconducting materials
Magnetization
magnetization
separators
Magnets
magnets
Magnetic separators
Cooling
cooling
water treatment
Superconducting magnets
Solenoids
superconducting magnets
solenoids
Separators
Water treatment
permanent magnets
Permanent magnets
Superconducting transition temperature

Keywords

  • High-temperature superconductor
  • Magnetic field
  • Magnetic separation
  • Magnetization process

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)

Cite this

Magnetization method for long high-Tc bulk superconductors used for magnetic separation. / Nishijima, Noriyo; Saho, Norihide; Asano, Katsuhiko; Hayashi, Hidemi; Tsutsumi, Katsuya; Murakami, Masato.

In: IEEE Transactions on Applied Superconductivity, Vol. 13, No. 2 II, 06.2003, p. 1580-1583.

Research output: Contribution to journalArticle

Nishijima, Noriyo ; Saho, Norihide ; Asano, Katsuhiko ; Hayashi, Hidemi ; Tsutsumi, Katsuya ; Murakami, Masato. / Magnetization method for long high-Tc bulk superconductors used for magnetic separation. In: IEEE Transactions on Applied Superconductivity. 2003 ; Vol. 13, No. 2 II. pp. 1580-1583.
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