Hot spot behavior of Y123 coated conductors

Satoshi Awaji; Ying Hou; Hidetoshi Oguro; Kazuo Watanabe; Itaru Inoue; Hisaki Sakamoto; Shinya Yasunaga; Jin Ryu

doi:10.1109/TASC.2011.2176710

Hot spot behavior of Y123 coated conductors

Satoshi Awaji, Ying Hou, Hidetoshi Oguro, Kazuo Watanabe, Itaru Inoue, Hisaki Sakamoto, Shinya Yasunaga, Jin Ryu

High Field Laboratory for Superconducting Materials

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

6 Citations (Scopus)

Abstract

We measured the time evolution of voltage and temperature of a CVD-Y123 coated conductor monolayer coil with Cu stabilizer under the cryocooled condition. The thermal runaway occurred locally at operate currents of 1.05-1.3 I _c at 38 K and 1-10 T. In this case, the hot spot originated from the inhomogeneity of I _c was observed. The thermal runaway generated from different parts of the tape at high and low fields at 38 K, respectively. This is due to the different heating behavior related to the I _c distribution. The critical heating power of the thermal runaway obtained in this study were about 30 mW at 38 K and 10 T. It weakly depends on magnetic filed but is independent to the temperature. The analysis suggests that the cooling condition for the transient phenomena such as the thermal runaway is poor.

Original language	English
Article number	6084711
Journal	IEEE Transactions on Applied Superconductivity
Volume	22
Issue number	3
DOIs	https://doi.org/10.1109/TASC.2011.2176710
Publication status	Published - 2012

Keywords

Critical current
high temperature superconducting wires
hot spot
thermal stability

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1109/TASC.2011.2176710

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title = "Hot spot behavior of Y123 coated conductors",

abstract = "We measured the time evolution of voltage and temperature of a CVD-Y123 coated conductor monolayer coil with Cu stabilizer under the cryocooled condition. The thermal runaway occurred locally at operate currents of 1.05-1.3 I c at 38 K and 1-10 T. In this case, the hot spot originated from the inhomogeneity of I c was observed. The thermal runaway generated from different parts of the tape at high and low fields at 38 K, respectively. This is due to the different heating behavior related to the I c distribution. The critical heating power of the thermal runaway obtained in this study were about 30 mW at 38 K and 10 T. It weakly depends on magnetic filed but is independent to the temperature. The analysis suggests that the cooling condition for the transient phenomena such as the thermal runaway is poor.",

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note = "Funding Information: Manuscript received September 13, 2011; accepted November 07, 2011. Date of publication November 18, 2011; date of current version May 24, 2012. This work was partly supported by NEDO. S. Awaji, Y. Hou, H. Oguro, and K. Watanabe are with the High Field Laboratory for Superconducting Materials, IMR, Tohoku University, Sendai 980-8577, Japan (e-mail: awaji@imr.tohoku.ac.jp). I. Inoue, H. Sakamoto, S. Yasunaga, and J. Ryu are with the Furukawa Electric Co., Ltd., Nikko 321-1493, Japan. Color versions of one or more of the figures in this paper are available online at http://ieeexplore.ieee.org. Digital Object Identifier 10.1109/TASC.2011.2176710",

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AU - Awaji, Satoshi

AU - Hou, Ying

AU - Oguro, Hidetoshi

AU - Watanabe, Kazuo

AU - Inoue, Itaru

AU - Sakamoto, Hisaki

AU - Yasunaga, Shinya

AU - Ryu, Jin

N1 - Funding Information: Manuscript received September 13, 2011; accepted November 07, 2011. Date of publication November 18, 2011; date of current version May 24, 2012. This work was partly supported by NEDO. S. Awaji, Y. Hou, H. Oguro, and K. Watanabe are with the High Field Laboratory for Superconducting Materials, IMR, Tohoku University, Sendai 980-8577, Japan (e-mail: awaji@imr.tohoku.ac.jp). I. Inoue, H. Sakamoto, S. Yasunaga, and J. Ryu are with the Furukawa Electric Co., Ltd., Nikko 321-1493, Japan. Color versions of one or more of the figures in this paper are available online at http://ieeexplore.ieee.org. Digital Object Identifier 10.1109/TASC.2011.2176710

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N2 - We measured the time evolution of voltage and temperature of a CVD-Y123 coated conductor monolayer coil with Cu stabilizer under the cryocooled condition. The thermal runaway occurred locally at operate currents of 1.05-1.3 I c at 38 K and 1-10 T. In this case, the hot spot originated from the inhomogeneity of I c was observed. The thermal runaway generated from different parts of the tape at high and low fields at 38 K, respectively. This is due to the different heating behavior related to the I c distribution. The critical heating power of the thermal runaway obtained in this study were about 30 mW at 38 K and 10 T. It weakly depends on magnetic filed but is independent to the temperature. The analysis suggests that the cooling condition for the transient phenomena such as the thermal runaway is poor.

AB - We measured the time evolution of voltage and temperature of a CVD-Y123 coated conductor monolayer coil with Cu stabilizer under the cryocooled condition. The thermal runaway occurred locally at operate currents of 1.05-1.3 I c at 38 K and 1-10 T. In this case, the hot spot originated from the inhomogeneity of I c was observed. The thermal runaway generated from different parts of the tape at high and low fields at 38 K, respectively. This is due to the different heating behavior related to the I c distribution. The critical heating power of the thermal runaway obtained in this study were about 30 mW at 38 K and 10 T. It weakly depends on magnetic filed but is independent to the temperature. The analysis suggests that the cooling condition for the transient phenomena such as the thermal runaway is poor.

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KW - high temperature superconducting wires

KW - hot spot

KW - thermal stability

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Hot spot behavior of Y123 coated conductors

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Keywords

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