Effect of preloading on the relaxation of the levitation force in bulk Y-Ba-Cu-O superconductors

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

doi:10.1016/j.physc.2005.02.155

Effect of preloading on the relaxation of the levitation force in bulk Y-Ba-Cu-O superconductors

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

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

6 Citations (Scopus)

Abstract

We have studied the effect of preloading on the relaxation of the levitation force of bulk Y-Ba-Cu-O superconductors. The levitation force was measured by applying the external field with a superconducting solenoid. We set the standard magnetic induction (B_st) to be 1.2 T supposing that the bulk Y-Ba-Cu-O disk experiences this field in operation. Preloading was applied such that the external field was first ramped to 1.1B_st and reduced to B_st. We confirmed that the preloading was effective in reducing the relaxation of the levitation force, although the effective levitation force was largely depressed compared to that without preloading. The employment of an extra step to lower the field below B_st before reaching B _st was effective in improving the effective levitation force without sacrificing the ability to reduce the relaxation rate. This is qualitatively understood in terms of the field distribution inside the disk based on the critical state model.

Original language	English
Pages (from-to)	789-793
Number of pages	5
Journal	Physica C: Superconductivity and its applications
Volume	426-431
Issue number	I
DOIs	https://doi.org/10.1016/j.physc.2005.02.155
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 superconductors
Flux flow
Levitation force
Shielding current distribution
Trapped magnetic field

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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Effect of preloading on the relaxation of the levitation force in bulk Y-Ba-Cu-O superconductors. / Komano, Y.; Ito, E.; Sawa, K.; Iwasa, Y.; Ichihara, T.; Sakai, N.; Hirabayashi, I.; Murakami, M.

In: Physica C: Superconductivity and its applications, Vol. 426-431, No. I, 01.10.2005, p. 789-793.

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

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abstract = "We have studied the effect of preloading on the relaxation of the levitation force of bulk Y-Ba-Cu-O superconductors. The levitation force was measured by applying the external field with a superconducting solenoid. We set the standard magnetic induction (Bst) to be 1.2 T supposing that the bulk Y-Ba-Cu-O disk experiences this field in operation. Preloading was applied such that the external field was first ramped to 1.1Bst and reduced to Bst. We confirmed that the preloading was effective in reducing the relaxation of the levitation force, although the effective levitation force was largely depressed compared to that without preloading. The employment of an extra step to lower the field below Bst before reaching B st was effective in improving the effective levitation force without sacrificing the ability to reduce the relaxation rate. This is qualitatively understood in terms of the field distribution inside the disk based on the critical state model.",

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AU - Komano, Y.

AU - Ito, E.

AU - Sawa, K.

AU - Iwasa, Y.

AU - Ichihara, T.

AU - Sakai, N.

AU - Hirabayashi, I.

AU - Murakami, M.

PY - 2005/10/1

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N2 - We have studied the effect of preloading on the relaxation of the levitation force of bulk Y-Ba-Cu-O superconductors. The levitation force was measured by applying the external field with a superconducting solenoid. We set the standard magnetic induction (Bst) to be 1.2 T supposing that the bulk Y-Ba-Cu-O disk experiences this field in operation. Preloading was applied such that the external field was first ramped to 1.1Bst and reduced to Bst. We confirmed that the preloading was effective in reducing the relaxation of the levitation force, although the effective levitation force was largely depressed compared to that without preloading. The employment of an extra step to lower the field below Bst before reaching B st was effective in improving the effective levitation force without sacrificing the ability to reduce the relaxation rate. This is qualitatively understood in terms of the field distribution inside the disk based on the critical state model.

AB - We have studied the effect of preloading on the relaxation of the levitation force of bulk Y-Ba-Cu-O superconductors. The levitation force was measured by applying the external field with a superconducting solenoid. We set the standard magnetic induction (Bst) to be 1.2 T supposing that the bulk Y-Ba-Cu-O disk experiences this field in operation. Preloading was applied such that the external field was first ramped to 1.1Bst and reduced to Bst. We confirmed that the preloading was effective in reducing the relaxation of the levitation force, although the effective levitation force was largely depressed compared to that without preloading. The employment of an extra step to lower the field below Bst before reaching B st was effective in improving the effective levitation force without sacrificing the ability to reduce the relaxation rate. This is qualitatively understood in terms of the field distribution inside the disk based on the critical state model.

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KW - Levitation force

KW - Shielding current distribution

KW - Trapped magnetic field

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