TY - JOUR
T1 - Experimental Validation of Theoretical Expressions on Additional AC Loss of Two-Strand Parallel Conductors Composed of REBa 2 Cu 3 O y Tapes via Pick-Up-Coil Method
AU - Miura, Shun
AU - Oki, Soichiro
AU - Furukawa, Takuma
AU - Iwakuma, Masataka
N1 - Funding Information:
This work was supported in part by the Japan Society for the Promotion of Science (JSPS): Grant-in-Aid-for Scientific Research under Grants JP17H06931 and JP18H03783, and in part by the Japan Science and Technology Agency (JST): Advanced Low Carbon Technology Research and Development Program (ALCA).
Funding Information:
Manuscript received October 26, 2018; accepted January 17, 2019. Date of publication January 25, 2019; date of current version February 11, 2019. This work was supported in part by the Japan Society for the Promotion of Science (JSPS): Grant-in-Aid-for Scientific Research under Grants JP17H06931 and JP18H03783, and in part by the Japan Science and Technology Agency (JST): Advanced Low Carbon Technology Research and Development Program (ALCA). (Corresponding author: Shun Miura.) The authors are with the Institute of Superconductor Systems, Kyushu University, Fukuoka 819-0395, Japan (e-mail:,miura@sc.kyushu-u.ac.jp).
Publisher Copyright:
© 2018 IEEE.
PY - 2019/8
Y1 - 2019/8
N2 - By a pick-up-coil method, the additional ac loss due to the formation of two-strand parallel conductors consisting of REBa 2 Cu 3 O y (REBCO, RE = rare earth) superconducting tapes was experimentally investigated. We recently improved the theoretical expression of the additional ac loss assuming that the voltage-current characteristics are expressed by the n-value model. The objective of this study is to prove the validity of the improved theoretical expression by experiment. The two insulated REBCO strands were cowound into a one-layer solenoidal coil. A uniform external magnetic field was applied in the axial direction of the sample coil. The additional ac losses were measured by the pick-up-coil method in sinusoidal ac magnetic fields whose maximum amplitude and frequency are 0.1 T and 10 Hz, respectively. The observed additional ac losses corresponded with the theoretical prediction. Therefore, it was concluded that the improved theoretical expression is more accurate than the previous one. At high-frequency regions, the observed additional ac losses slightly deviated from the theoretical predictions.
AB - By a pick-up-coil method, the additional ac loss due to the formation of two-strand parallel conductors consisting of REBa 2 Cu 3 O y (REBCO, RE = rare earth) superconducting tapes was experimentally investigated. We recently improved the theoretical expression of the additional ac loss assuming that the voltage-current characteristics are expressed by the n-value model. The objective of this study is to prove the validity of the improved theoretical expression by experiment. The two insulated REBCO strands were cowound into a one-layer solenoidal coil. A uniform external magnetic field was applied in the axial direction of the sample coil. The additional ac losses were measured by the pick-up-coil method in sinusoidal ac magnetic fields whose maximum amplitude and frequency are 0.1 T and 10 Hz, respectively. The observed additional ac losses corresponded with the theoretical prediction. Therefore, it was concluded that the improved theoretical expression is more accurate than the previous one. At high-frequency regions, the observed additional ac losses slightly deviated from the theoretical predictions.
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U2 - 10.1109/TASC.2019.2895496
DO - 10.1109/TASC.2019.2895496
M3 - Article
AN - SCOPUS:85061631096
VL - 29
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
SN - 1051-8223
IS - 5
M1 - 8626543
ER -