期刊
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
卷 27, 期 4, 页码 -出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TASC.2016.2638431
关键词
Undulator; 2G-HTS magnet; REBCO; epoxy; racetrack coil; vacuum impregnation; nanopowder fillers
资金
- Laboratory Directed Research and Development from Argonne National Laboratory by Office of Science, of the U.S. Department of Energy [DE-AC02-06CH11357]
- U.S. Department of Energy, Office of Basic Energy Sciences, as a part of the Center for Emergent Superconductivity Energy Frontier Research Center
- Office of Science, U.S. Department of Energy [DE-AC02-06CH11357]
The use of second-generation high-temperature superconducting-coated conductors enables an enhancement of the performance of undulator magnets. However, preventing the motion of the wire and providing sufficient conduction cooling to the winding stacks have remained challenges. In this study, we have evaluated epoxy impregnation techniques to address these issues. Epoxy resin was prepared with different nanopowders and the effect on the performance of the undulator coil pack was investigated. All epoxy impregnated coils showed smaller n values and some degree of deterioration of the critical current I-c. The I-c degradation was most pronounced for epoxy mixed with high aspect ratio multiwalled carbon nanotubes (MWCNTs). It has been found that the crack formation in the epoxy results in plastic deformation of the copper stabilizer layer, which causes the underlying ceramic REBCO superconducting layer to crack resulting in degradation of the superconducting tape performance. Careful adjustment of epoxy thickness surrounding the superconductor and the powder ratio in the epoxy eliminate the performance degradation.
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