Quench Protection Study of a 14 T Conduction-Cooled Magnet Built with Nb3Sn and NbTi Superconducting Coils for PPMS

Shunzhong Chen; Wanshuo Sun; Yaohui Wang; Yinming Dai; Jinshui Sun; Junsheng Cheng; Zili Zhang; Hui Liu; Qiuliang Wang

doi:10.1109/TASC.2022.3213919

Quench Protection Study of a 14 T Conduction-Cooled Magnet Built with Nb₃Sn and NbTi Superconducting Coils for PPMS

Shunzhong Chen
, Wanshuo Sun
, Yaohui Wang
, Yinming Dai
, Jinshui Sun
, Junsheng Cheng
, Zili Zhang
, Hui Liu
, Qiuliang Wang

School of Electrical Engineering

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

7 Scopus citations

Abstract

A 14 T conduction-cooled superconducting magnet with a clear cold bore of 50 mm in diameter is designed and fabricated for a physical property measurement system. The magnet is built with six Nb3Sn coils and five NbTi coils arranged coaxially. To reliably protect the 14 T magnet, a passive quench protection scheme is developed, including a novel coil subdivision method and heater network design. The novel coil subdivision method mixes a NbTi coil and an Nb3Sn coil into the same subdivision to reduce the hot-spot temperature of the Nb3Sn coil. Different heaters parameters are compared and analyzed to obtain a lower hot-spot temperature. In addition, an efficient way of raising the ratio of copper to superconductor in the superconducting wires is used to reduce the hot-spot temperature of the Nb3Sn coils in the low magnetic field region. An in-house quench simulation code in MATLAB, including a finite difference method for the Nb3Sn coils in the low magnetic field region and a quench ellipsoid propagation model for the other coils, has been developed. This article describes the details of the passive quench protection scheme and presents the quench simulation results.

Original language	English
Article number	4900107
Journal	IEEE Transactions on Applied Superconductivity
Volume	33
Issue number	1
DOIs	https://doi.org/10.1109/TASC.2022.3213919
State	Published - 1 Jan 2023

Keywords

NbSn
quench protection
quench simulation
superconducting magnet

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10.1109/TASC.2022.3213919

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title = "Quench Protection Study of a 14 T Conduction-Cooled Magnet Built with Nb3Sn and NbTi Superconducting Coils for PPMS",

abstract = "A 14 T conduction-cooled superconducting magnet with a clear cold bore of 50 mm in diameter is designed and fabricated for a physical property measurement system. The magnet is built with six Nb3Sn coils and five NbTi coils arranged coaxially. To reliably protect the 14 T magnet, a passive quench protection scheme is developed, including a novel coil subdivision method and heater network design. The novel coil subdivision method mixes a NbTi coil and an Nb3Sn coil into the same subdivision to reduce the hot-spot temperature of the Nb3Sn coil. Different heaters parameters are compared and analyzed to obtain a lower hot-spot temperature. In addition, an efficient way of raising the ratio of copper to superconductor in the superconducting wires is used to reduce the hot-spot temperature of the Nb3Sn coils in the low magnetic field region. An in-house quench simulation code in MATLAB, including a finite difference method for the Nb3Sn coils in the low magnetic field region and a quench ellipsoid propagation model for the other coils, has been developed. This article describes the details of the passive quench protection scheme and presents the quench simulation results.",

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author = "Shunzhong Chen and Wanshuo Sun and Yaohui Wang and Yinming Dai and Jinshui Sun and Junsheng Cheng and Zili Zhang and Hui Liu and Qiuliang Wang",

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AU - Chen, Shunzhong

AU - Sun, Wanshuo

AU - Wang, Yaohui

AU - Dai, Yinming

AU - Sun, Jinshui

AU - Cheng, Junsheng

AU - Zhang, Zili

AU - Liu, Hui

AU - Wang, Qiuliang

PY - 2023/1/1

Y1 - 2023/1/1

N2 - A 14 T conduction-cooled superconducting magnet with a clear cold bore of 50 mm in diameter is designed and fabricated for a physical property measurement system. The magnet is built with six Nb3Sn coils and five NbTi coils arranged coaxially. To reliably protect the 14 T magnet, a passive quench protection scheme is developed, including a novel coil subdivision method and heater network design. The novel coil subdivision method mixes a NbTi coil and an Nb3Sn coil into the same subdivision to reduce the hot-spot temperature of the Nb3Sn coil. Different heaters parameters are compared and analyzed to obtain a lower hot-spot temperature. In addition, an efficient way of raising the ratio of copper to superconductor in the superconducting wires is used to reduce the hot-spot temperature of the Nb3Sn coils in the low magnetic field region. An in-house quench simulation code in MATLAB, including a finite difference method for the Nb3Sn coils in the low magnetic field region and a quench ellipsoid propagation model for the other coils, has been developed. This article describes the details of the passive quench protection scheme and presents the quench simulation results.

AB - A 14 T conduction-cooled superconducting magnet with a clear cold bore of 50 mm in diameter is designed and fabricated for a physical property measurement system. The magnet is built with six Nb3Sn coils and five NbTi coils arranged coaxially. To reliably protect the 14 T magnet, a passive quench protection scheme is developed, including a novel coil subdivision method and heater network design. The novel coil subdivision method mixes a NbTi coil and an Nb3Sn coil into the same subdivision to reduce the hot-spot temperature of the Nb3Sn coil. Different heaters parameters are compared and analyzed to obtain a lower hot-spot temperature. In addition, an efficient way of raising the ratio of copper to superconductor in the superconducting wires is used to reduce the hot-spot temperature of the Nb3Sn coils in the low magnetic field region. An in-house quench simulation code in MATLAB, including a finite difference method for the Nb3Sn coils in the low magnetic field region and a quench ellipsoid propagation model for the other coils, has been developed. This article describes the details of the passive quench protection scheme and presents the quench simulation results.

KW - NbSn

KW - quench protection

KW - quench simulation

KW - superconducting magnet

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JO - IEEE Transactions on Applied Superconductivity

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ER -

Quench Protection Study of a 14 T Conduction-Cooled Magnet Built with Nb₃Sn and NbTi Superconducting Coils for PPMS

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