Superconducting and Mechanical Properties of Impregnated REBCO Pancake Coils Under Large Hoop Stress

We performed hoop stress tests of REBCO multilayer pancake coils impregnated by epoxy resin. The mechanical deformation and electric field-current properties were measured under the large hoop stress. The maximum hoop stress of about 530 MPa per Hastelloy substrate, calculated from the BJR relation,...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2013-06, Vol.23 (3), p.4600305-4600305
Main Authors: Awaji, S., Oguro, H., Suwa, T., Suzuki, T., Watanabe, K., Nishijima, G., Hanai, S., Marukawa, K., Daibo, M., Saito, T., Sakamoto, H., Inoue, I., Miyoshi, Y., Chaud, X., Debray, F., Tixador, P.
Format: Article
Language:English
Subjects:
Applied sciences
Coiling
Coils
Conductors
Critical current
Deformation
Degradation
Electric connection. Cables. Wiring
Electrical engineering. Electrical power engineering
electromagnetic stress
Electromagnetism
Electromagnets
Exact sciences and technology
Finite element analysis
hoop strain
Hoop stress
Integrated circuits
Magnetic fields
Nickel base alloys
Pancake coils
Physics
REBCO coated conductor
Strain
Stress
Stresses
Studies
Superalloys
superconducting magnet
Superconducting magnets
Superconductivity
Various equipment and components
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Summary:We performed hoop stress tests of REBCO multilayer pancake coils impregnated by epoxy resin. The mechanical deformation and electric field-current properties were measured under the large hoop stress. The maximum hoop stress of about 530 MPa per Hastelloy substrate, calculated from the BJR relation, was applied in the background magnetic field of 8 T. Because the hoop stress level is much smaller than the mechanical tolerance of the GdBCO tape, the coil performance was limited by the angular dependence of critical current in this test. Furthermore, the hoop stress test under the large electromagnetic stresses was also carried out for the other (Y, Gd)BCO coil. The (Y, Gd)BCO epoxy impregnated coil was operated without any degradation even in the huge hoop stress over 1300 MPa. The mechanical deformation of the coil is analysed on the basis of the measured strains. We confirmed the large strain about 0.3%-0.5% because of the hoop stress over 1300 MPa at I op = 460 A and B = 13.5 T but no degradation of the coils. However, it is suggested that the coil deformation is very complicated under the large electromagnetic stress.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2012.2229775