TY - JOUR
T1 - Evaluation Criterion for Determining Turn-to-Turn Contact Electrical Resistance Satisfying High Thermal Stability and Shortening Charging Delay in NI-REBCO Coils for MRIs
AU - Yoshihara, Yuka
AU - Hamanaka, Mai
AU - Tsuyoshi, Kyoka
AU - Kitamura, Mayu
AU - Nemoto, Ui
AU - Noguchi, So
AU - Ishiyama, Atsushi
N1 - Funding Information:
Manuscript received November 29, 2020; revised February 13, 2021; accepted March 10, 2021. Date of publication March 18, 2021; date of current version May 6, 2021. This work was supported by JSPS Grant-in-Aid for Scientific Research (S) from the Ministry of Education, Science, Sports, and Culture (No. 18H05244). (Corresponding author: Yuka Yoshihara.) Yuka Yoshihara, Mai Hamanaka, Kyoka Tsuyoshi, Mayu Kitamura, Ui Nemoto, and Atsushi Ishiyama are with Waseda University, Shinjuku-ku, Tokyo 169-8555, Japan (e-mail: y-yshr.h27@moegi.waseda.jp; atsushi@waseda.jp).
Publisher Copyright:
© 2002-2011 IEEE.
PY - 2021/8
Y1 - 2021/8
N2 - We have been developing a no-insulation (NI) coil technology to achieve high thermal stability and high current density. NI coils can continue to operate even if a part of the coils degrades; however, a charging delay occurs in the coils. Moreover, the turn-to-turn contact electrical resistance of the NI coils must be increased to shorten the charging delay; however, a large turn-to-turn contact electrical resistance reduces thermal stability. In this study, using turn-to-turn contact electrical resistance and IOP/IC ratios as parameters, we analyze thermal stability and consider the possibility that NI coils can continue to operate even if they have local defects. Furthermore, to establish an evaluation criterion for determining turn-to-turn contact electrical resistance that can shorten charging delay and ensure high thermal stability, we analyze and evaluate the relationship between turn-to-turn contact electrical resistance and thermal stability, focusing on three types of heat generation.
AB - We have been developing a no-insulation (NI) coil technology to achieve high thermal stability and high current density. NI coils can continue to operate even if a part of the coils degrades; however, a charging delay occurs in the coils. Moreover, the turn-to-turn contact electrical resistance of the NI coils must be increased to shorten the charging delay; however, a large turn-to-turn contact electrical resistance reduces thermal stability. In this study, using turn-to-turn contact electrical resistance and IOP/IC ratios as parameters, we analyze thermal stability and consider the possibility that NI coils can continue to operate even if they have local defects. Furthermore, to establish an evaluation criterion for determining turn-to-turn contact electrical resistance that can shorten charging delay and ensure high thermal stability, we analyze and evaluate the relationship between turn-to-turn contact electrical resistance and thermal stability, focusing on three types of heat generation.
KW - Defect
KW - REBCO coil
KW - no-insulation
KW - thermal stability
KW - turn-to-turn contact electrical resistance
UR - http://www.scopus.com/inward/record.url?scp=85103299217&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85103299217&partnerID=8YFLogxK
U2 - 10.1109/TASC.2021.3067239
DO - 10.1109/TASC.2021.3067239
M3 - Article
AN - SCOPUS:85103299217
SN - 1051-8223
VL - 31
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 5
M1 - 9381674
ER -