TY - JOUR
T1 - Numerical evaluation of the deformation of REBCO pancake coil, considering winding tension, thermal stress, and screening-current-induced stress
AU - Ueda, Hiroshi
AU - Awazu, Yuta
AU - Tokunaga, Keisuke
AU - Kim, Seokbeom
N1 - Funding Information:
The part of this work was supported by Grant-in-Aid for Scientific Research (C) Grant No. 16K06222 of the Ministry of Education, Science, Sports and Culture, and Research Grant (Basic Research) of TEPCO Memorial Foundation, JST-Mirai Program Grant No. JPMJMI17A2, Japan.
Publisher Copyright:
© 2021 IOP Publishing Ltd.
PY - 2021/2
Y1 - 2021/2
N2 - In recent years, the applications of high-field REBa2CuOy (REBCO) coils have remarkably progressed towards NMR MRIs, accelerators, and other such devices. In a REBCO coil, the magnetic field due to the screening current is generated in the direction opposite to the field by the transport current, thus reducing the magnetic field, deteriorating the field homogeneity, and affecting the time stability of the magnetic field. Recently, the additional force and stress due to the screening current (referred to as screening-current-induced stress) has become a topic of concern. The screening current results in non-uniform current distributions in the REBCO tape. Therefore, the distribution of electromagnetic force in REBCO coils differs from that during the designing of the coil, assuming that the current flow in the tape is uniform. Thus, there is the possibility that the existence of screening current is a serious problem in the mechanical design of REBCO coils. In this study, we evaluate the electromagnetic force and stress due to the screening current by using the developed numerical simulation code for the electromagnetics and stress. We discuss the winding tension, thermal and electromagnetic stresses, and mechanical strength structure of the REBCO coil.
AB - In recent years, the applications of high-field REBa2CuOy (REBCO) coils have remarkably progressed towards NMR MRIs, accelerators, and other such devices. In a REBCO coil, the magnetic field due to the screening current is generated in the direction opposite to the field by the transport current, thus reducing the magnetic field, deteriorating the field homogeneity, and affecting the time stability of the magnetic field. Recently, the additional force and stress due to the screening current (referred to as screening-current-induced stress) has become a topic of concern. The screening current results in non-uniform current distributions in the REBCO tape. Therefore, the distribution of electromagnetic force in REBCO coils differs from that during the designing of the coil, assuming that the current flow in the tape is uniform. Thus, there is the possibility that the existence of screening current is a serious problem in the mechanical design of REBCO coils. In this study, we evaluate the electromagnetic force and stress due to the screening current by using the developed numerical simulation code for the electromagnetics and stress. We discuss the winding tension, thermal and electromagnetic stresses, and mechanical strength structure of the REBCO coil.
KW - Mechanical stress
KW - REBCO magnet
KW - Screening current
KW - Thermal stress
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U2 - 10.1088/1361-6668/abcd24
DO - 10.1088/1361-6668/abcd24
M3 - Article
AN - SCOPUS:85100339883
VL - 34
JO - Superconductor Science and Technology
JF - Superconductor Science and Technology
SN - 0953-2048
IS - 2
M1 - 024003
ER -