TY - JOUR
T1 - Strengthening effect of 'Yoroi-coil structure' against electromagnetic force
AU - Watanabe, Tomonori
AU - Nagaya, Shigeo
AU - Hirano, Naoki
AU - Awaji, Satoshi
AU - Oguro, Hidetoshi
AU - Tsuchiya, Yuji
AU - Omura, Takuya
AU - Nimori, Shigeki
AU - Shimizu, Tadashi
AU - Ishiyama, Atsushi
AU - Wang, Xudong
N1 - Publisher Copyright:
© 2002-2011 IEEE.
PY - 2015/6/1
Y1 - 2015/6/1
N2 - The strengthening of Yoroi-coil (Y-based oxide superconductor and reinforcing outer integrated coil) structure at stronger electromagnetic force was investigated using the Yoroi-coil structured double-pancake coil with higher strength outer plates of carbon-fiber reinforced plastic (C-FRP) than those of glass-FRP. The coil achieved 1.14 kA transporting at 4.2 K in 14-T back-up magnetic field and the superconducting wire was burnt by thermal runaway after that. The calculated maximum hoop stress, based on the BJR (magnetic field × current density × coil radius) calculations, at the hoop stress test reached 2.0 GPa. This value was far exceeding the tensile strength of superconducting wire ranging from 1 to 1.3 GPa; however, the maximum strain of superconducting wire in the test coil was held about 0.5%. Yoroi-coil structure is useful for the applications, which need high magnetic field precision. The strengthening effect of C-FRP outer plates was observed at outer part of the coil, but it did not cover the whole coil body, so that arrangement of reinforcing outer plates could admit of some improvement.
AB - The strengthening of Yoroi-coil (Y-based oxide superconductor and reinforcing outer integrated coil) structure at stronger electromagnetic force was investigated using the Yoroi-coil structured double-pancake coil with higher strength outer plates of carbon-fiber reinforced plastic (C-FRP) than those of glass-FRP. The coil achieved 1.14 kA transporting at 4.2 K in 14-T back-up magnetic field and the superconducting wire was burnt by thermal runaway after that. The calculated maximum hoop stress, based on the BJR (magnetic field × current density × coil radius) calculations, at the hoop stress test reached 2.0 GPa. This value was far exceeding the tensile strength of superconducting wire ranging from 1 to 1.3 GPa; however, the maximum strain of superconducting wire in the test coil was held about 0.5%. Yoroi-coil structure is useful for the applications, which need high magnetic field precision. The strengthening effect of C-FRP outer plates was observed at outer part of the coil, but it did not cover the whole coil body, so that arrangement of reinforcing outer plates could admit of some improvement.
KW - Electromagnetic forces
KW - Hoop stress
KW - Yttrium based coated conductor
KW - carbon-fiber reinforced plastic
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U2 - 10.1109/TASC.2014.2364675
DO - 10.1109/TASC.2014.2364675
M3 - Article
AN - SCOPUS:84921489777
SN - 1051-8223
VL - 25
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 3
M1 - 6935072
ER -