Experimental and analytical studies on non-uniformity properties of HTS bulk annuli for high magnetic performance applications

Seok Beom Kim, Y. Yano, N. Hayashi, Jin Hong Joo

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In designing and manufacturing of a new type of compact nuclear magnetic resonance/magnetic resonance imaging magnet, which consists of a stacked high-temperature superconducting (HTS) bulk annuli, the spatial homogeneity and the temporal stability of the trapped magnetic fields are the key issues. On the other hand, there is an asymmetry problem for superconducting properties including the critical current density along the axial (thickness) direction in HTS bulks due to its manufacturing process using a seed crystal located at the top surface. Therefore, in this study, we find the nonuniformity of the critical current density of the HTS bulk along the axial direction, which probably comes from the quench-melt-growth process using a seed crystal. The measured axial positions of the maximum magnetic field were slightly shifted to the bottom direction lower than the axial center position. The critical current density and/or superconducting properties of HTS bulks are probably decreased in proportion to the distance from a seed crystal. Therefore, the superconducting properties along the thickness direction in the HTS bulk were represented as a variable Jc-B and electrical conductivity.

Original languageEnglish
Article number6472039
JournalIEEE Transactions on Applied Superconductivity
Volume23
Issue number3
DOIs
Publication statusPublished - 2013

Fingerprint

annuli
nonuniformity
seeds
critical current
current density
Crystals
manufacturing
Temperature
trapped magnetic fields
Magnetic fields
crystals
Magnetic resonance
homogeneity
Magnets
magnetic resonance
proportion
magnets
Nuclear magnetic resonance
asymmetry
Imaging techniques

Keywords

  • Electrical conductivity
  • high-temperature superconducting (HTS) bulks
  • J-B characteristics
  • nonuniform properties

ASJC Scopus subject areas

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

Cite this

Experimental and analytical studies on non-uniformity properties of HTS bulk annuli for high magnetic performance applications. / Kim, Seok Beom; Yano, Y.; Hayashi, N.; Joo, Jin Hong.

In: IEEE Transactions on Applied Superconductivity, Vol. 23, No. 3, 6472039, 2013.

Research output: Contribution to journalArticle

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