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.
| 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 | |
| Publication status | Published - 2005 Oct 1 |
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Keywords
- Bulk superconductors
- Flux flow
- Levitation force
- Shielding current distribution
- Trapped magnetic field
ASJC Scopus subject areas
- Condensed Matter Physics
Cite this
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, Naomichi; Hirabayashi, I.; Murakami, Masato.
In: Physica C: Superconductivity and its Applications, Vol. 426-431, No. I, 01.10.2005, p. 789-793.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effect of preloading on the relaxation of the levitation force in bulk Y-Ba-Cu-O superconductors
AU - Komano, Y.
AU - Ito, E.
AU - Sawa, K.
AU - Iwasa, Y.
AU - Ichihara, T.
AU - Sakai, Naomichi
AU - Hirabayashi, I.
AU - Murakami, Masato
PY - 2005/10/1
Y1 - 2005/10/1
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.
KW - Bulk superconductors
KW - Flux flow
KW - Levitation force
KW - Shielding current distribution
KW - Trapped magnetic field
UR - http://www.scopus.com/inward/record.url?scp=25444511067&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=25444511067&partnerID=8YFLogxK
U2 - 10.1016/j.physc.2005.02.155
DO - 10.1016/j.physc.2005.02.155
M3 - Article
AN - SCOPUS:25444511067
VL - 426-431
SP - 789
EP - 793
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - I
ER -