A Long Charging Delay for a No-Insulation REBCO Layer-Wound Coil and Its Influence on Operation With Outer LTS Coils

Kyoko Yanagisawa; Seiya Iguchi; Yi Xu; Jing Li; Akiko T. Saito; Hideki Nakagome; Tomoaki Takao; Shinji Matsumoto; Mamoru Hamada; Yoshinori Yanagisawa

doi:10.1109/TASC.2016.2515540

A Long Charging Delay for a No-Insulation REBCO Layer-Wound Coil and Its Influence on Operation With Outer LTS Coils

Kyoko Yanagisawa, Seiya Iguchi, Yi Xu, Jing Li, Akiko T. Saito, Hideki Nakagome, Tomoaki Takao, Shinji Matsumoto, Mamoru Hamada, Yoshinori Yanagisawa

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

18 Citations (Scopus)

Abstract

This paper presents a long charging delay for a no-insulation (NI) REBCO layer-wound (LW) coil and an electromagnetic-induced thermal runaway, resulting in damages on the coil. A small NI REBCO LW coil with a self-inductance of 1.62 mH showed a charging delay time constant of ∼3000 s at 4.2 K. The coil was installed in the cold bore of a low-temperature superconducting (LTS) magnet, and the LTS outer coil was charged. Although the circuit of the NI REBCO LW coil was opened, the induced current inside the coil screened the magnetic field generated by the outer coils. Eventually, the NI REBCO LW coil showed a thermal runaway during charging the outer coils. After the experiment, we found burnouts of the REBCO conductor near the electrodes and buckling of the conductor for all the layers of the winding. The present results point out the technical problem and the worst case for a NI REBCO LW coil, which must be considered.

Original language	English
Article number	7383240
Journal	IEEE Transactions on Applied Superconductivity
Volume	26
Issue number	4
DOIs	https://doi.org/10.1109/TASC.2016.2515540
Publication status	Published - 2016 Jun
Externally published	Yes

Keywords

REBCO layer-wound coil
electromagnetic-induced thermal runaway
no-insulation

ASJC Scopus subject areas

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

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10.1109/TASC.2016.2515540

Cite this

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title = "A Long Charging Delay for a No-Insulation REBCO Layer-Wound Coil and Its Influence on Operation With Outer LTS Coils",

abstract = "This paper presents a long charging delay for a no-insulation (NI) REBCO layer-wound (LW) coil and an electromagnetic-induced thermal runaway, resulting in damages on the coil. A small NI REBCO LW coil with a self-inductance of 1.62 mH showed a charging delay time constant of ∼3000 s at 4.2 K. The coil was installed in the cold bore of a low-temperature superconducting (LTS) magnet, and the LTS outer coil was charged. Although the circuit of the NI REBCO LW coil was opened, the induced current inside the coil screened the magnetic field generated by the outer coils. Eventually, the NI REBCO LW coil showed a thermal runaway during charging the outer coils. After the experiment, we found burnouts of the REBCO conductor near the electrodes and buckling of the conductor for all the layers of the winding. The present results point out the technical problem and the worst case for a NI REBCO LW coil, which must be considered.",

keywords = "REBCO layer-wound coil, electromagnetic-induced thermal runaway, no-insulation",

author = "Kyoko Yanagisawa and Seiya Iguchi and Yi Xu and Jing Li and Saito, {Akiko T.} and Hideki Nakagome and Tomoaki Takao and Shinji Matsumoto and Mamoru Hamada and Yoshinori Yanagisawa",

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language = "English",

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T1 - A Long Charging Delay for a No-Insulation REBCO Layer-Wound Coil and Its Influence on Operation With Outer LTS Coils

AU - Yanagisawa, Kyoko

AU - Iguchi, Seiya

AU - Xu, Yi

AU - Li, Jing

AU - Saito, Akiko T.

AU - Nakagome, Hideki

AU - Takao, Tomoaki

AU - Matsumoto, Shinji

AU - Hamada, Mamoru

AU - Yanagisawa, Yoshinori

PY - 2016/6

Y1 - 2016/6

N2 - This paper presents a long charging delay for a no-insulation (NI) REBCO layer-wound (LW) coil and an electromagnetic-induced thermal runaway, resulting in damages on the coil. A small NI REBCO LW coil with a self-inductance of 1.62 mH showed a charging delay time constant of ∼3000 s at 4.2 K. The coil was installed in the cold bore of a low-temperature superconducting (LTS) magnet, and the LTS outer coil was charged. Although the circuit of the NI REBCO LW coil was opened, the induced current inside the coil screened the magnetic field generated by the outer coils. Eventually, the NI REBCO LW coil showed a thermal runaway during charging the outer coils. After the experiment, we found burnouts of the REBCO conductor near the electrodes and buckling of the conductor for all the layers of the winding. The present results point out the technical problem and the worst case for a NI REBCO LW coil, which must be considered.

AB - This paper presents a long charging delay for a no-insulation (NI) REBCO layer-wound (LW) coil and an electromagnetic-induced thermal runaway, resulting in damages on the coil. A small NI REBCO LW coil with a self-inductance of 1.62 mH showed a charging delay time constant of ∼3000 s at 4.2 K. The coil was installed in the cold bore of a low-temperature superconducting (LTS) magnet, and the LTS outer coil was charged. Although the circuit of the NI REBCO LW coil was opened, the induced current inside the coil screened the magnetic field generated by the outer coils. Eventually, the NI REBCO LW coil showed a thermal runaway during charging the outer coils. After the experiment, we found burnouts of the REBCO conductor near the electrodes and buckling of the conductor for all the layers of the winding. The present results point out the technical problem and the worst case for a NI REBCO LW coil, which must be considered.

KW - REBCO layer-wound coil

KW - electromagnetic-induced thermal runaway

KW - no-insulation

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A Long Charging Delay for a No-Insulation REBCO Layer-Wound Coil and Its Influence on Operation With Outer LTS Coils

Abstract

Keywords

ASJC Scopus subject areas

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