Abstract
We study to increase the trapped magnetic field of a REBCO bulk magnet excited by pulsed field magnetization (PFM). In PFM, a soft-iron yoke is used to expose the bulk to the magnetic field for a long time. Although a small yoke 40 mm in diameter was used in our previous study, it was changed to a large yoke 64 mm in diameter in this paper. Accordingly, the pulse width was extended by 13%. When a GdBCO bulk 60 mm in diameter and 20 mm thick was magnetized by varying an amplitude of the applied field and temperature in a bulk magnet system using a two-stage GM-type refrigerator with a cooling capacity of 12 W at 20 K, the maximum trapped flux density reached 4.07 T on the center of the bulk surface and 2.56 T on the pole surface at 20 K. Moreover, the total magnetic flux was 3.28 mWb, which was about 13% larger than that of a small yoke. This result suggests that this method is useful in practice because the trapped field can be enhanced only by changing the soft-iron yoke.
| Original language | English |
|---|---|
| Article number | 012046 |
| Journal | Journal of Physics: Conference Series |
| Volume | 1293 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2019 Oct 15 |
| Event | 31st International Symposium on Superconductivity, ISS 2018 - Tsukuba, Ibaraki, Japan Duration: 2018 Dec 12 → 2018 Dec 14 |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
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Improvement of the trapped field of REBCO bulk activated by pulsed field magnetization with a large soft-iron yoke. / Yokoyama, K.; Oka, T.
In: Journal of Physics: Conference Series, Vol. 1293, No. 1, 012046, 15.10.2019.Research output: Contribution to journal › Conference article
}
TY - JOUR
T1 - Improvement of the trapped field of REBCO bulk activated by pulsed field magnetization with a large soft-iron yoke
AU - Yokoyama, K.
AU - Oka, T.
PY - 2019/10/15
Y1 - 2019/10/15
N2 - We study to increase the trapped magnetic field of a REBCO bulk magnet excited by pulsed field magnetization (PFM). In PFM, a soft-iron yoke is used to expose the bulk to the magnetic field for a long time. Although a small yoke 40 mm in diameter was used in our previous study, it was changed to a large yoke 64 mm in diameter in this paper. Accordingly, the pulse width was extended by 13%. When a GdBCO bulk 60 mm in diameter and 20 mm thick was magnetized by varying an amplitude of the applied field and temperature in a bulk magnet system using a two-stage GM-type refrigerator with a cooling capacity of 12 W at 20 K, the maximum trapped flux density reached 4.07 T on the center of the bulk surface and 2.56 T on the pole surface at 20 K. Moreover, the total magnetic flux was 3.28 mWb, which was about 13% larger than that of a small yoke. This result suggests that this method is useful in practice because the trapped field can be enhanced only by changing the soft-iron yoke.
AB - We study to increase the trapped magnetic field of a REBCO bulk magnet excited by pulsed field magnetization (PFM). In PFM, a soft-iron yoke is used to expose the bulk to the magnetic field for a long time. Although a small yoke 40 mm in diameter was used in our previous study, it was changed to a large yoke 64 mm in diameter in this paper. Accordingly, the pulse width was extended by 13%. When a GdBCO bulk 60 mm in diameter and 20 mm thick was magnetized by varying an amplitude of the applied field and temperature in a bulk magnet system using a two-stage GM-type refrigerator with a cooling capacity of 12 W at 20 K, the maximum trapped flux density reached 4.07 T on the center of the bulk surface and 2.56 T on the pole surface at 20 K. Moreover, the total magnetic flux was 3.28 mWb, which was about 13% larger than that of a small yoke. This result suggests that this method is useful in practice because the trapped field can be enhanced only by changing the soft-iron yoke.
UR - http://www.scopus.com/inward/record.url?scp=85075925665&partnerID=8YFLogxK
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U2 - 10.1088/1742-6596/1293/1/012046
DO - 10.1088/1742-6596/1293/1/012046
M3 - Conference article
AN - SCOPUS:85075925665
VL - 1293
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
SN - 1742-6588
IS - 1
M1 - 012046
ER -