TY - JOUR
T1 - Magnetizing characteristic evaluation of REBCO bulk in PFM using different yokes
AU - Yokoyama, K.
AU - Oka, T.
N1 - Publisher Copyright:
© Published under licence by IOP Publishing Ltd.
PY - 2020/6/19
Y1 - 2020/6/19
N2 - A REBCO bulk magnet is able to generate a several-Tesla-class magnetic field by a compact system with low power consumption. Pulsed field magnetization (PFM), which is one of major magnetization method, has the advantage that the bulk is activated using a conventional equipment in a few seconds, and, therefore, it is suitable for practical use. However, a trapped field is lower than the maximum performance of material. To increase the field, improvement of magnetization method and modification of exciting equipment are considered. We aim to improve the trapped field by changing the exciting system simply and inexpensively. In the bulk magnet system, soft-iron yokes are generally used to extend the pulse width. This paper evaluated magnetizing characteristic quantitatively. A single pulsed field was applied to a new GdBCO bulk using φ64-mm and φ80-mm soft-iron yokes. The pulse width of φ80-mm yoke was about 35% longer than that of φ64-mm yoke. When comparing the trapped flux density and total magnetic flux, these values of φ80-mm yoke were higher than those of φ64-mm yoke. Also, the temperature rise of φ80-mm yoke was decreased by approximately 5% as compared with φ64-mm yoke, implying that the same effect as the long-pulse method was achieved.
AB - A REBCO bulk magnet is able to generate a several-Tesla-class magnetic field by a compact system with low power consumption. Pulsed field magnetization (PFM), which is one of major magnetization method, has the advantage that the bulk is activated using a conventional equipment in a few seconds, and, therefore, it is suitable for practical use. However, a trapped field is lower than the maximum performance of material. To increase the field, improvement of magnetization method and modification of exciting equipment are considered. We aim to improve the trapped field by changing the exciting system simply and inexpensively. In the bulk magnet system, soft-iron yokes are generally used to extend the pulse width. This paper evaluated magnetizing characteristic quantitatively. A single pulsed field was applied to a new GdBCO bulk using φ64-mm and φ80-mm soft-iron yokes. The pulse width of φ80-mm yoke was about 35% longer than that of φ64-mm yoke. When comparing the trapped flux density and total magnetic flux, these values of φ80-mm yoke were higher than those of φ64-mm yoke. Also, the temperature rise of φ80-mm yoke was decreased by approximately 5% as compared with φ64-mm yoke, implying that the same effect as the long-pulse method was achieved.
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U2 - 10.1088/1742-6596/1559/1/012047
DO - 10.1088/1742-6596/1559/1/012047
M3 - Conference article
AN - SCOPUS:85088090010
VL - 1559
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
SN - 1742-6588
IS - 1
M1 - 012047
T2 - 14th European Conference on Applied Superconductivity, EUCAS 2019
Y2 - 1 September 2019 through 5 September 2019
ER -