TY - JOUR
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.
N1 - Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.
PY - 2013
Y1 - 2013
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.
KW - Cryogen-free superconducting magnet
KW - CuNb-reinforced NbSn
KW - YBaCuO
KW - hybrid magnet
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U2 - 10.1109/TASC.2012.2236872
DO - 10.1109/TASC.2012.2236872
M3 - Article
AN - SCOPUS:84873835890
VL - 23
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
SN - 1051-8223
IS - 3
M1 - 6399571
ER -