Pulsed Field Magnetization of GdBaCuO Superconducting Bulks With High Magnetization Efficiency Using a Split-Type Coil With Soft Iron Yoke

Motoki Shinden; Devendra K. Namburi; Keita Takahashi; Hiroyuki Fujishiro; Mark D. Ainslie

doi:10.1109/TASC.2022.3167340

Pulsed Field Magnetization of GdBaCuO Superconducting Bulks With High Magnetization Efficiency Using a Split-Type Coil With Soft Iron Yoke

Motoki Shinden^*, Devendra K. Namburi, Keita Takahashi, Hiroyuki Fujishiro, Mark D. Ainslie

^*Corresponding author for this work

Engineering

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

Pulsed field magnetization (PFM) and field-cooled magnetization (FCM) have been carried out for GdBaCuO disk-shaped bulks fabricated by two-step buffer-assisted (BA)-top seeded infiltration growth (TSIG) technique, and the results are compared with those of bulks fabricated by conventional top seeded melt growth (TSMG) technique. In both PFM and FCM experiments, the two-step BA-TSIG bulks showed higher trapped field properties than the TSMG bulks and, in particular, the maximum trapped field by PFM was over 3.5 T at 40 K using a split-type coil with soft iron yokes. The magnetization efficiency, BTmax/Bapp∗, was defined to evaluate the trapped field efficiency quantitatively, where BTmax is the maximum trapped field and Bapp∗ is the optimum applied field to achieve BTmax at each operating temperature. A high efficiency over 80% was achieved for the two-step BA-TSIG bulks at 40 K, which was nearly 10% higher than that for the TSMG bulks. These results were due to the high critical current density, Jc, and the thinness of the two-step BA-TSIG bulks, readily causing flux jumps to assist in achieving higher trapped fields.

Original language	English
Article number	6801305
Journal	IEEE Transactions on Applied Superconductivity
Volume	32
Issue number	6
DOIs	https://doi.org/10.1109/TASC.2022.3167340
Publication status	Published - 1 Sept 2022

Keywords

Bulk superconductor
magnetization efficiency
pulsed-field magnetization (PFM)
trapped field magnet
two-step BA-TSIG bulk

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10.1109/TASC.2022.3167340

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title = "Pulsed Field Magnetization of GdBaCuO Superconducting Bulks With High Magnetization Efficiency Using a Split-Type Coil With Soft Iron Yoke",

abstract = "Pulsed field magnetization (PFM) and field-cooled magnetization (FCM) have been carried out for GdBaCuO disk-shaped bulks fabricated by two-step buffer-assisted (BA)-top seeded infiltration growth (TSIG) technique, and the results are compared with those of bulks fabricated by conventional top seeded melt growth (TSMG) technique. In both PFM and FCM experiments, the two-step BA-TSIG bulks showed higher trapped field properties than the TSMG bulks and, in particular, the maximum trapped field by PFM was over 3.5 T at 40 K using a split-type coil with soft iron yokes. The magnetization efficiency, BTmax/Bapp∗, was defined to evaluate the trapped field efficiency quantitatively, where BTmax is the maximum trapped field and Bapp∗ is the optimum applied field to achieve BTmax at each operating temperature. A high efficiency over 80% was achieved for the two-step BA-TSIG bulks at 40 K, which was nearly 10% higher than that for the TSMG bulks. These results were due to the high critical current density, Jc, and the thinness of the two-step BA-TSIG bulks, readily causing flux jumps to assist in achieving higher trapped fields.",

keywords = "Bulk superconductor, magnetization efficiency, pulsed-field magnetization (PFM), trapped field magnet, two-step BA-TSIG bulk",

author = "Motoki Shinden and Namburi, {Devendra K.} and Keita Takahashi and Hiroyuki Fujishiro and Ainslie, {Mark D.}",

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AU - Namburi, Devendra K.

AU - Takahashi, Keita

AU - Fujishiro, Hiroyuki

AU - Ainslie, Mark D.

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N2 - Pulsed field magnetization (PFM) and field-cooled magnetization (FCM) have been carried out for GdBaCuO disk-shaped bulks fabricated by two-step buffer-assisted (BA)-top seeded infiltration growth (TSIG) technique, and the results are compared with those of bulks fabricated by conventional top seeded melt growth (TSMG) technique. In both PFM and FCM experiments, the two-step BA-TSIG bulks showed higher trapped field properties than the TSMG bulks and, in particular, the maximum trapped field by PFM was over 3.5 T at 40 K using a split-type coil with soft iron yokes. The magnetization efficiency, BTmax/Bapp∗, was defined to evaluate the trapped field efficiency quantitatively, where BTmax is the maximum trapped field and Bapp∗ is the optimum applied field to achieve BTmax at each operating temperature. A high efficiency over 80% was achieved for the two-step BA-TSIG bulks at 40 K, which was nearly 10% higher than that for the TSMG bulks. These results were due to the high critical current density, Jc, and the thinness of the two-step BA-TSIG bulks, readily causing flux jumps to assist in achieving higher trapped fields.

AB - Pulsed field magnetization (PFM) and field-cooled magnetization (FCM) have been carried out for GdBaCuO disk-shaped bulks fabricated by two-step buffer-assisted (BA)-top seeded infiltration growth (TSIG) technique, and the results are compared with those of bulks fabricated by conventional top seeded melt growth (TSMG) technique. In both PFM and FCM experiments, the two-step BA-TSIG bulks showed higher trapped field properties than the TSMG bulks and, in particular, the maximum trapped field by PFM was over 3.5 T at 40 K using a split-type coil with soft iron yokes. The magnetization efficiency, BTmax/Bapp∗, was defined to evaluate the trapped field efficiency quantitatively, where BTmax is the maximum trapped field and Bapp∗ is the optimum applied field to achieve BTmax at each operating temperature. A high efficiency over 80% was achieved for the two-step BA-TSIG bulks at 40 K, which was nearly 10% higher than that for the TSMG bulks. These results were due to the high critical current density, Jc, and the thinness of the two-step BA-TSIG bulks, readily causing flux jumps to assist in achieving higher trapped fields.

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Pulsed Field Magnetization of GdBaCuO Superconducting Bulks With High Magnetization Efficiency Using a Split-Type Coil With Soft Iron Yoke

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