A Numerical Proposal of an After Heating Method for Pulse Field Magnetization for HTS Bulk Magnets

Jun Ogawa, Tetsuo Oka, Satoshi Fukui, Takao Sato, Naoto Watanabe

Research output: Contribution to journalArticle

Abstract

Pulse field magnetization (PFM) for HTS bulk magnets has the advantage of a field cooling method, because it does not require a superconducting magnet. To reach the largest trapped magnetic field in the HTS bulk using the PFM method requires repeated applications of the pulse magnetic fields to the HTS bulk with controlled temperature and amplitude of the pulse magnetic field. We previously reported the influence of HTS bulk properties on the PFM method, and our numerical results corresponded with the experimental results when a single pulse magnetic field was applied. In this study, we applied multi pulse magnetic fields to the HTS bulk using this numerical model. The results show the outer and inner shielding currents in the HTS bulk exist in opposite directions, while the surface magnetic field is reduced by the magnetic field produced by the negative direction current. We suggest a new method to reduce the outer shielding current using a heater. Our numerical results demonstrate the possibility of increasing the peak of the trapped magnetic field in the heating method.

Original languageEnglish
Article number6945334
JournalIEEE Transactions on Applied Superconductivity
Volume25
Issue number3
DOIs
Publication statusPublished - 2015 Jun 1
Externally publishedYes

Fingerprint

Magnets
proposals
Magnetization
magnets
Magnetic fields
Heating
magnetization
heating
pulses
magnetic fields
trapped magnetic fields
shielding
Shielding
superconducting magnets
Superconducting magnets
heaters
Numerical models
cooling
Cooling

Keywords

  • After heating method (AHM)
  • HTS bulk
  • numerical analysis
  • pulse field magnetization (PFM) process

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

A Numerical Proposal of an After Heating Method for Pulse Field Magnetization for HTS Bulk Magnets. / Ogawa, Jun; Oka, Tetsuo; Fukui, Satoshi; Sato, Takao; Watanabe, Naoto.

In: IEEE Transactions on Applied Superconductivity, Vol. 25, No. 3, 6945334, 01.06.2015.

Research output: Contribution to journalArticle

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AU - Watanabe, Naoto

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AB - Pulse field magnetization (PFM) for HTS bulk magnets has the advantage of a field cooling method, because it does not require a superconducting magnet. To reach the largest trapped magnetic field in the HTS bulk using the PFM method requires repeated applications of the pulse magnetic fields to the HTS bulk with controlled temperature and amplitude of the pulse magnetic field. We previously reported the influence of HTS bulk properties on the PFM method, and our numerical results corresponded with the experimental results when a single pulse magnetic field was applied. In this study, we applied multi pulse magnetic fields to the HTS bulk using this numerical model. The results show the outer and inner shielding currents in the HTS bulk exist in opposite directions, while the surface magnetic field is reduced by the magnetic field produced by the negative direction current. We suggest a new method to reduce the outer shielding current using a heater. Our numerical results demonstrate the possibility of increasing the peak of the trapped magnetic field in the heating method.

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