Three-dimensional field measurements of levitated HTS and the modeling of the shielding current

E. Ito; Y. Komano; K. Sawa; Y. Iwasa; N. Sakai; I. Hirabayashi; M. Murakami

doi:10.1016/j.physc.2005.05.027

Three-dimensional field measurements of levitated HTS and the modeling of the shielding current

E. Ito, Y. Komano, K. Sawa, Y. Iwasa, N. Sakai, I. Hirabayashi, M. Murakami

Research output: Contribution to journal › Conference article › peer-review

3 Citations (Scopus)

Abstract

We developed a shielding current distribution model in a bulk superconductor with the aim of estimating the levitation force. First, we directly measured the magnetic field in axial and radial directions above a bulk Y-Ba-Cu-O superconductor levitated by an electromagnet using a three-dimensional Hall sensor. We then calculated the field distribution by assuming two types of the shielding current distributions and compared the results with the measured values. The field distributions based on the model in that the shielding currents are flowing concentrically at the surface were not in good agreement with the measured data. We then assumed that the shielding currents are not uniform and the boundary has the form of nth hyperbola, which could reproduce the measured field distribution reasonably well.

Original language	English
Pages (from-to)	731-738
Number of pages	8
Journal	Physica C: Superconductivity and its applications
Volume	426-431
Issue number	I
DOIs	https://doi.org/10.1016/j.physc.2005.05.027
Publication status	Published - 2005 Oct 1
Event	Proceedings of the 17th International Symposium on Superconductivity (ISS 2004) Advances in Supeconductivity - Duration: 2004 Nov 23 → 2004 Nov 25

Keywords

Bulk superconductor
Levitation
Shielding current distribution
Y-Ba-Cu-O

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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title = "Three-dimensional field measurements of levitated HTS and the modeling of the shielding current",

abstract = "We developed a shielding current distribution model in a bulk superconductor with the aim of estimating the levitation force. First, we directly measured the magnetic field in axial and radial directions above a bulk Y-Ba-Cu-O superconductor levitated by an electromagnet using a three-dimensional Hall sensor. We then calculated the field distribution by assuming two types of the shielding current distributions and compared the results with the measured values. The field distributions based on the model in that the shielding currents are flowing concentrically at the surface were not in good agreement with the measured data. We then assumed that the shielding currents are not uniform and the boundary has the form of nth hyperbola, which could reproduce the measured field distribution reasonably well.",

keywords = "Bulk superconductor, Levitation, Shielding current distribution, Y-Ba-Cu-O",

author = "E. Ito and Y. Komano and K. Sawa and Y. Iwasa and N. Sakai and I. Hirabayashi and M. Murakami",

year = "2005",

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TY - JOUR

T1 - Three-dimensional field measurements of levitated HTS and the modeling of the shielding current

AU - Ito, E.

AU - Komano, Y.

AU - Sawa, K.

AU - Iwasa, Y.

AU - Sakai, N.

AU - Hirabayashi, I.

AU - Murakami, M.

PY - 2005/10/1

Y1 - 2005/10/1

N2 - We developed a shielding current distribution model in a bulk superconductor with the aim of estimating the levitation force. First, we directly measured the magnetic field in axial and radial directions above a bulk Y-Ba-Cu-O superconductor levitated by an electromagnet using a three-dimensional Hall sensor. We then calculated the field distribution by assuming two types of the shielding current distributions and compared the results with the measured values. The field distributions based on the model in that the shielding currents are flowing concentrically at the surface were not in good agreement with the measured data. We then assumed that the shielding currents are not uniform and the boundary has the form of nth hyperbola, which could reproduce the measured field distribution reasonably well.

AB - We developed a shielding current distribution model in a bulk superconductor with the aim of estimating the levitation force. First, we directly measured the magnetic field in axial and radial directions above a bulk Y-Ba-Cu-O superconductor levitated by an electromagnet using a three-dimensional Hall sensor. We then calculated the field distribution by assuming two types of the shielding current distributions and compared the results with the measured values. The field distributions based on the model in that the shielding currents are flowing concentrically at the surface were not in good agreement with the measured data. We then assumed that the shielding currents are not uniform and the boundary has the form of nth hyperbola, which could reproduce the measured field distribution reasonably well.

KW - Bulk superconductor

KW - Levitation

KW - Shielding current distribution

KW - Y-Ba-Cu-O

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