Abstract
Recent upsizing of the diameter and enhancement of performance of bulk superconductors make pulsed field magnetization difficult due to the strong magnetic shield. We propose a bulk material with small holes to supply magnetic flux into the bulk efficiently because superconductivity is intentionally lowered in the portion with holes. On the other hand, we are anxious about the flux flow in a high applied field. To investigate the effect of the proposed method, a bulk material with small holes was manufactured, and a fundamental experiment was carried out. Four holes of 2 mm in diameter were drilled in a growth sector region of a GdBa2Cu3O7-x bulk material of 60 mm in diameter and 20 mm thickness. The holes were filled with solder to improve mechanical strength and heat conduction. The bulk was cooled to 20, 30, 40, and 50 K, and a single pulsed field was applied while changing the amplitude of the applied field at each temperature. It was confirmed that the magnetic flux penetrates at a low applied field as compared with the holeless bulk material, and, moreover, the flux flow was suppressed in a high applied field at a low temperature.
| Original language | English |
|---|---|
| Article number | 6403884 |
| Journal | IEEE Transactions on Applied Superconductivity |
| Volume | 23 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2013 Feb 11 |
| Externally published | Yes |
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Keywords
- Flux flow
- flux penetration
- pulsed field magnetization
- small hole
- superconducting bulk magnet
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Condensed Matter Physics
- Electronic, Optical and Magnetic Materials
Cite this
Evaluation of pulsed-field magnetization of a bulk superconductor with small holes. / Yokoyama, K.; Oka, Tetsuo; Kondo, N.; Hosaka, S.
In: IEEE Transactions on Applied Superconductivity, Vol. 23, No. 3, 6403884, 11.02.2013.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Evaluation of pulsed-field magnetization of a bulk superconductor with small holes
AU - Yokoyama, K.
AU - Oka, Tetsuo
AU - Kondo, N.
AU - Hosaka, S.
PY - 2013/2/11
Y1 - 2013/2/11
N2 - Recent upsizing of the diameter and enhancement of performance of bulk superconductors make pulsed field magnetization difficult due to the strong magnetic shield. We propose a bulk material with small holes to supply magnetic flux into the bulk efficiently because superconductivity is intentionally lowered in the portion with holes. On the other hand, we are anxious about the flux flow in a high applied field. To investigate the effect of the proposed method, a bulk material with small holes was manufactured, and a fundamental experiment was carried out. Four holes of 2 mm in diameter were drilled in a growth sector region of a GdBa2Cu3O7-x bulk material of 60 mm in diameter and 20 mm thickness. The holes were filled with solder to improve mechanical strength and heat conduction. The bulk was cooled to 20, 30, 40, and 50 K, and a single pulsed field was applied while changing the amplitude of the applied field at each temperature. It was confirmed that the magnetic flux penetrates at a low applied field as compared with the holeless bulk material, and, moreover, the flux flow was suppressed in a high applied field at a low temperature.
AB - Recent upsizing of the diameter and enhancement of performance of bulk superconductors make pulsed field magnetization difficult due to the strong magnetic shield. We propose a bulk material with small holes to supply magnetic flux into the bulk efficiently because superconductivity is intentionally lowered in the portion with holes. On the other hand, we are anxious about the flux flow in a high applied field. To investigate the effect of the proposed method, a bulk material with small holes was manufactured, and a fundamental experiment was carried out. Four holes of 2 mm in diameter were drilled in a growth sector region of a GdBa2Cu3O7-x bulk material of 60 mm in diameter and 20 mm thickness. The holes were filled with solder to improve mechanical strength and heat conduction. The bulk was cooled to 20, 30, 40, and 50 K, and a single pulsed field was applied while changing the amplitude of the applied field at each temperature. It was confirmed that the magnetic flux penetrates at a low applied field as compared with the holeless bulk material, and, moreover, the flux flow was suppressed in a high applied field at a low temperature.
KW - Flux flow
KW - flux penetration
KW - pulsed field magnetization
KW - small hole
KW - superconducting bulk magnet
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UR - http://www.scopus.com/inward/citedby.url?scp=84873403293&partnerID=8YFLogxK
U2 - 10.1109/TASC.2013.2237934
DO - 10.1109/TASC.2013.2237934
M3 - Article
AN - SCOPUS:84873403293
VL - 23
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
SN - 1051-8223
IS - 3
M1 - 6403884
ER -