Round robin measurements of the flux trapping properties of melt processed Sm-Ba-Cu-O bulk superconductors

D. A. Cardwell, Masato Murakami, M. Zeisberger, W. Gawalek, R. Gonzalez-Arrabal, M. Eisterer, H. W. Weber, G. Fuchs, G. Krabbes, A. Leenders, H. C. Freyhardt, X. Chaud, R. Tournier, N. Hari Babu

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Scanning Hall probe round robin measurements of the trapped field of two CFRF-clad, epoxy resin-reinforced large grain samples of Sm-Ba-Cu-O fabricated at ISTEC-SRL by top seeded melt growth (TSMG) have been performed by five European laboratories over a two year period under the auspice of the Versailles Project on Advanced Materials and Standards (VAMAS) and Technical Committee 90 (TC90) of the International Electrotechnical Commission (IEC). This study completes the interim report of the round robin tests presented at the fourth PASREG Workshop, Jena, July 2003. The peak fields derived from flux profiles measured by the different groups are found to correlate to within 6% over the measurement period. The flux trapping ability of the samples, measured by the peak field in the upper surface, deteriorated over the period of measurement by around 2% and 1%, respectively. Overall the measurements suggest that the trapped flux profile is most sensitive to changes in magnetizing field, experimental geometry and the sample-Hall probe separation. As a result, variations in these parameters should be minimized during flux mapping. In general a magnetizing field of 1.75 times the maximum trapped field for field cooled (FC) samples is required to ensure complete magnetization of a homogeneous cylindrical sample with an aspect ratio of ≈2.5, corresponding to the geometry of the samples measured here. Finally, 20 min relaxation time following magnetization was observed to be sufficient to yield consistent measurement of the peak trapped field within the error of the measurement, which was typically less than 4%. Other than the recommended magnetizing field of 3 T, which should be determined by aspect ratio, temperature and maximum trapped field rather than pre-defined, the experimental conditions were confirmed to lie within the guidelines described in a draft International Electrotechnical Commission (IEC) Technical Committee 90 (TC90) standardization document on flux mapping. On the basis of the present results the proposed 5% spread in measured trapped field and a 20 min relaxation period appear to be reasonable criteria for trapped field measurements performed at different laboratories.

Original languageEnglish
Pages (from-to)623-632
Number of pages10
JournalPhysica C: Superconductivity and its Applications
Volume412-414
Issue numberSPEC. ISS.
DOIs
Publication statusPublished - 2004 Oct
Externally publishedYes

Fingerprint

Flux pinning
Superconducting materials
trapping
flux mapping
Fluxes
aspect ratio
Aspect ratio
Magnetization
Epoxy Resins
magnetization
draft
Geometry
probes
standardization
epoxy resins
profiles
geometry
Epoxy resins
Relaxation time
Standardization

Keywords

  • Bulk YBCO superconductors
  • Standardization measurements
  • Trapped magnetic field

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Round robin measurements of the flux trapping properties of melt processed Sm-Ba-Cu-O bulk superconductors. / Cardwell, D. A.; Murakami, Masato; Zeisberger, M.; Gawalek, W.; Gonzalez-Arrabal, R.; Eisterer, M.; Weber, H. W.; Fuchs, G.; Krabbes, G.; Leenders, A.; Freyhardt, H. C.; Chaud, X.; Tournier, R.; Babu, N. Hari.

In: Physica C: Superconductivity and its Applications, Vol. 412-414, No. SPEC. ISS., 10.2004, p. 623-632.

Research output: Contribution to journalArticle

Cardwell, DA, Murakami, M, Zeisberger, M, Gawalek, W, Gonzalez-Arrabal, R, Eisterer, M, Weber, HW, Fuchs, G, Krabbes, G, Leenders, A, Freyhardt, HC, Chaud, X, Tournier, R & Babu, NH 2004, 'Round robin measurements of the flux trapping properties of melt processed Sm-Ba-Cu-O bulk superconductors', Physica C: Superconductivity and its Applications, vol. 412-414, no. SPEC. ISS., pp. 623-632. https://doi.org/10.1016/j.physc.2004.01.082
Cardwell, D. A. ; Murakami, Masato ; Zeisberger, M. ; Gawalek, W. ; Gonzalez-Arrabal, R. ; Eisterer, M. ; Weber, H. W. ; Fuchs, G. ; Krabbes, G. ; Leenders, A. ; Freyhardt, H. C. ; Chaud, X. ; Tournier, R. ; Babu, N. Hari. / Round robin measurements of the flux trapping properties of melt processed Sm-Ba-Cu-O bulk superconductors. In: Physica C: Superconductivity and its Applications. 2004 ; Vol. 412-414, No. SPEC. ISS. pp. 623-632.
@article{17d818ffabb14190a2bf3c811575603e,
title = "Round robin measurements of the flux trapping properties of melt processed Sm-Ba-Cu-O bulk superconductors",
abstract = "Scanning Hall probe round robin measurements of the trapped field of two CFRF-clad, epoxy resin-reinforced large grain samples of Sm-Ba-Cu-O fabricated at ISTEC-SRL by top seeded melt growth (TSMG) have been performed by five European laboratories over a two year period under the auspice of the Versailles Project on Advanced Materials and Standards (VAMAS) and Technical Committee 90 (TC90) of the International Electrotechnical Commission (IEC). This study completes the interim report of the round robin tests presented at the fourth PASREG Workshop, Jena, July 2003. The peak fields derived from flux profiles measured by the different groups are found to correlate to within 6{\%} over the measurement period. The flux trapping ability of the samples, measured by the peak field in the upper surface, deteriorated over the period of measurement by around 2{\%} and 1{\%}, respectively. Overall the measurements suggest that the trapped flux profile is most sensitive to changes in magnetizing field, experimental geometry and the sample-Hall probe separation. As a result, variations in these parameters should be minimized during flux mapping. In general a magnetizing field of 1.75 times the maximum trapped field for field cooled (FC) samples is required to ensure complete magnetization of a homogeneous cylindrical sample with an aspect ratio of ≈2.5, corresponding to the geometry of the samples measured here. Finally, 20 min relaxation time following magnetization was observed to be sufficient to yield consistent measurement of the peak trapped field within the error of the measurement, which was typically less than 4{\%}. Other than the recommended magnetizing field of 3 T, which should be determined by aspect ratio, temperature and maximum trapped field rather than pre-defined, the experimental conditions were confirmed to lie within the guidelines described in a draft International Electrotechnical Commission (IEC) Technical Committee 90 (TC90) standardization document on flux mapping. On the basis of the present results the proposed 5{\%} spread in measured trapped field and a 20 min relaxation period appear to be reasonable criteria for trapped field measurements performed at different laboratories.",
keywords = "Bulk YBCO superconductors, Standardization measurements, Trapped magnetic field",
author = "Cardwell, {D. A.} and Masato Murakami and M. Zeisberger and W. Gawalek and R. Gonzalez-Arrabal and M. Eisterer and Weber, {H. W.} and G. Fuchs and G. Krabbes and A. Leenders and Freyhardt, {H. C.} and X. Chaud and R. Tournier and Babu, {N. Hari}",
year = "2004",
month = "10",
doi = "10.1016/j.physc.2004.01.082",
language = "English",
volume = "412-414",
pages = "623--632",
journal = "Physica C: Superconductivity and its Applications",
issn = "0921-4534",
publisher = "Elsevier",
number = "SPEC. ISS.",

}

TY - JOUR

T1 - Round robin measurements of the flux trapping properties of melt processed Sm-Ba-Cu-O bulk superconductors

AU - Cardwell, D. A.

AU - Murakami, Masato

AU - Zeisberger, M.

AU - Gawalek, W.

AU - Gonzalez-Arrabal, R.

AU - Eisterer, M.

AU - Weber, H. W.

AU - Fuchs, G.

AU - Krabbes, G.

AU - Leenders, A.

AU - Freyhardt, H. C.

AU - Chaud, X.

AU - Tournier, R.

AU - Babu, N. Hari

PY - 2004/10

Y1 - 2004/10

N2 - Scanning Hall probe round robin measurements of the trapped field of two CFRF-clad, epoxy resin-reinforced large grain samples of Sm-Ba-Cu-O fabricated at ISTEC-SRL by top seeded melt growth (TSMG) have been performed by five European laboratories over a two year period under the auspice of the Versailles Project on Advanced Materials and Standards (VAMAS) and Technical Committee 90 (TC90) of the International Electrotechnical Commission (IEC). This study completes the interim report of the round robin tests presented at the fourth PASREG Workshop, Jena, July 2003. The peak fields derived from flux profiles measured by the different groups are found to correlate to within 6% over the measurement period. The flux trapping ability of the samples, measured by the peak field in the upper surface, deteriorated over the period of measurement by around 2% and 1%, respectively. Overall the measurements suggest that the trapped flux profile is most sensitive to changes in magnetizing field, experimental geometry and the sample-Hall probe separation. As a result, variations in these parameters should be minimized during flux mapping. In general a magnetizing field of 1.75 times the maximum trapped field for field cooled (FC) samples is required to ensure complete magnetization of a homogeneous cylindrical sample with an aspect ratio of ≈2.5, corresponding to the geometry of the samples measured here. Finally, 20 min relaxation time following magnetization was observed to be sufficient to yield consistent measurement of the peak trapped field within the error of the measurement, which was typically less than 4%. Other than the recommended magnetizing field of 3 T, which should be determined by aspect ratio, temperature and maximum trapped field rather than pre-defined, the experimental conditions were confirmed to lie within the guidelines described in a draft International Electrotechnical Commission (IEC) Technical Committee 90 (TC90) standardization document on flux mapping. On the basis of the present results the proposed 5% spread in measured trapped field and a 20 min relaxation period appear to be reasonable criteria for trapped field measurements performed at different laboratories.

AB - Scanning Hall probe round robin measurements of the trapped field of two CFRF-clad, epoxy resin-reinforced large grain samples of Sm-Ba-Cu-O fabricated at ISTEC-SRL by top seeded melt growth (TSMG) have been performed by five European laboratories over a two year period under the auspice of the Versailles Project on Advanced Materials and Standards (VAMAS) and Technical Committee 90 (TC90) of the International Electrotechnical Commission (IEC). This study completes the interim report of the round robin tests presented at the fourth PASREG Workshop, Jena, July 2003. The peak fields derived from flux profiles measured by the different groups are found to correlate to within 6% over the measurement period. The flux trapping ability of the samples, measured by the peak field in the upper surface, deteriorated over the period of measurement by around 2% and 1%, respectively. Overall the measurements suggest that the trapped flux profile is most sensitive to changes in magnetizing field, experimental geometry and the sample-Hall probe separation. As a result, variations in these parameters should be minimized during flux mapping. In general a magnetizing field of 1.75 times the maximum trapped field for field cooled (FC) samples is required to ensure complete magnetization of a homogeneous cylindrical sample with an aspect ratio of ≈2.5, corresponding to the geometry of the samples measured here. Finally, 20 min relaxation time following magnetization was observed to be sufficient to yield consistent measurement of the peak trapped field within the error of the measurement, which was typically less than 4%. Other than the recommended magnetizing field of 3 T, which should be determined by aspect ratio, temperature and maximum trapped field rather than pre-defined, the experimental conditions were confirmed to lie within the guidelines described in a draft International Electrotechnical Commission (IEC) Technical Committee 90 (TC90) standardization document on flux mapping. On the basis of the present results the proposed 5% spread in measured trapped field and a 20 min relaxation period appear to be reasonable criteria for trapped field measurements performed at different laboratories.

KW - Bulk YBCO superconductors

KW - Standardization measurements

KW - Trapped magnetic field

UR - http://www.scopus.com/inward/record.url?scp=4644371332&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=4644371332&partnerID=8YFLogxK

U2 - 10.1016/j.physc.2004.01.082

DO - 10.1016/j.physc.2004.01.082

M3 - Article

AN - SCOPUS:4644371332

VL - 412-414

SP - 623

EP - 632

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

SN - 0921-4534

IS - SPEC. ISS.

ER -