Upgrade design to a cryogen-free 20-t superconducting outsert for a 47-t hybrid magnet

K. Watanabe; S. Awaji; Y. Hou; H. Oguro; T. Kiyoshi; H. Kumakura; S. Hanai; H. Tsubouchi; M. Sugimoto; I. Inoue

doi:10.1109/TASC.2012.2236872

Upgrade design to a cryogen-free 20-t superconducting outsert for a 47-t hybrid magnet

K. Watanabe, S. Awaji, Y. Hou, H. Oguro, T. Kiyoshi, H. Kumakura, S. Hanai, H. Tsubouchi, M. Sugimoto, I. Inoue

High Field Laboratory for Superconducting Materials

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

6 Citations (Scopus)

Abstract

A Rutherford flat cable composed of sixteen 0.8-mm-diameter Nb ₃Sn strands with CuNb-reinforced stabilizers (CuNb/Nb₃Sn) has been developed for use as an outsert for a 47-T hybrid magnet. To guarantee the safety of the magnet in the event of a quench, the low residual resistance ratio characteristic of arc-melted-in-situ CuNb composite had to be improved upon, and to obtain high electric conductivity, a new CuNb fabrication method using a Nb rod was attempted. The thermal runaway characteristics of chemical vapor deposition-YBa₂Cu₃O_7-δ (Y123) coated-conductor tapes with varying Cu stabilizer thicknesses were measured in magnetic fields of up to 10 T at temperatures ranging from 17 to 60 K. It was found that the ratio of the thermal runaway over-current to the critical current decreases as temperature decreases and that thermal runaway occurs just above the critical current level at 5 K. The properties of a cryogen-free, 20-T superconducting outsert for a 47-T hybrid magnet utilizing CuNb/Nb₃Sn Rutherford flat cables and Y123 tapes and having a room temperature bore of 400 mm were investigated.

Original language	English
Article number	6399571
Journal	IEEE Transactions on Applied Superconductivity
Volume	23
Issue number	3
DOIs	https://doi.org/10.1109/TASC.2012.2236872
Publication status	Published - 2013 Feb 4

Keywords

Cryogen-free superconducting magnet
CuNb-reinforced NbSn
YBaCuO
hybrid magnet

ASJC Scopus subject areas

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

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title = "Upgrade design to a cryogen-free 20-t superconducting outsert for a 47-t hybrid magnet",

abstract = "A Rutherford flat cable composed of sixteen 0.8-mm-diameter Nb 3Sn strands with CuNb-reinforced stabilizers (CuNb/Nb3Sn) has been developed for use as an outsert for a 47-T hybrid magnet. To guarantee the safety of the magnet in the event of a quench, the low residual resistance ratio characteristic of arc-melted-in-situ CuNb composite had to be improved upon, and to obtain high electric conductivity, a new CuNb fabrication method using a Nb rod was attempted. The thermal runaway characteristics of chemical vapor deposition-YBa2Cu3O7-δ (Y123) coated-conductor tapes with varying Cu stabilizer thicknesses were measured in magnetic fields of up to 10 T at temperatures ranging from 17 to 60 K. It was found that the ratio of the thermal runaway over-current to the critical current decreases as temperature decreases and that thermal runaway occurs just above the critical current level at 5 K. The properties of a cryogen-free, 20-T superconducting outsert for a 47-T hybrid magnet utilizing CuNb/Nb3Sn Rutherford flat cables and Y123 tapes and having a room temperature bore of 400 mm were investigated.",

keywords = "Cryogen-free superconducting magnet, CuNb-reinforced NbSn, YBaCuO, hybrid magnet",

author = "K. Watanabe and S. Awaji and Y. Hou and H. Oguro and T. Kiyoshi and H. Kumakura and S. Hanai and H. Tsubouchi and M. Sugimoto and I. Inoue",

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T1 - Upgrade design to a cryogen-free 20-t superconducting outsert for a 47-t hybrid magnet

AU - Watanabe, K.

AU - Awaji, S.

AU - Hou, Y.

AU - Oguro, H.

AU - Kiyoshi, T.

AU - Kumakura, H.

AU - Hanai, S.

AU - Tsubouchi, H.

AU - Sugimoto, M.

AU - Inoue, I.

PY - 2013/2/4

Y1 - 2013/2/4

N2 - A Rutherford flat cable composed of sixteen 0.8-mm-diameter Nb 3Sn strands with CuNb-reinforced stabilizers (CuNb/Nb3Sn) has been developed for use as an outsert for a 47-T hybrid magnet. To guarantee the safety of the magnet in the event of a quench, the low residual resistance ratio characteristic of arc-melted-in-situ CuNb composite had to be improved upon, and to obtain high electric conductivity, a new CuNb fabrication method using a Nb rod was attempted. The thermal runaway characteristics of chemical vapor deposition-YBa2Cu3O7-δ (Y123) coated-conductor tapes with varying Cu stabilizer thicknesses were measured in magnetic fields of up to 10 T at temperatures ranging from 17 to 60 K. It was found that the ratio of the thermal runaway over-current to the critical current decreases as temperature decreases and that thermal runaway occurs just above the critical current level at 5 K. The properties of a cryogen-free, 20-T superconducting outsert for a 47-T hybrid magnet utilizing CuNb/Nb3Sn Rutherford flat cables and Y123 tapes and having a room temperature bore of 400 mm were investigated.

AB - A Rutherford flat cable composed of sixteen 0.8-mm-diameter Nb 3Sn strands with CuNb-reinforced stabilizers (CuNb/Nb3Sn) has been developed for use as an outsert for a 47-T hybrid magnet. To guarantee the safety of the magnet in the event of a quench, the low residual resistance ratio characteristic of arc-melted-in-situ CuNb composite had to be improved upon, and to obtain high electric conductivity, a new CuNb fabrication method using a Nb rod was attempted. The thermal runaway characteristics of chemical vapor deposition-YBa2Cu3O7-δ (Y123) coated-conductor tapes with varying Cu stabilizer thicknesses were measured in magnetic fields of up to 10 T at temperatures ranging from 17 to 60 K. It was found that the ratio of the thermal runaway over-current to the critical current decreases as temperature decreases and that thermal runaway occurs just above the critical current level at 5 K. The properties of a cryogen-free, 20-T superconducting outsert for a 47-T hybrid magnet utilizing CuNb/Nb3Sn Rutherford flat cables and Y123 tapes and having a room temperature bore of 400 mm were investigated.

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KW - YBaCuO

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