TY - JOUR
T1 - Thermal and Electromagnetic Simulation of Multistacked No-Insulation REBCO Pancake Coils on Normal-State Transition by PEEC Method
AU - Miyao, Ryosuke
AU - Igarashi, Hajime
AU - Ishiyama, Atsushi
AU - Noguchi, So
N1 - Funding Information:
Manuscript received August 28, 2017; accepted November 30, 2017. Date of publication December 8, 2017; date of current version January 19, 2018. This work was supported by the JSPS KAKENHI Grant 15KK0192. (Corresponding author: Ryosuke Miyao.) R. Miyao and H. Igarashi are with the Graduate School of Information Science and Technology, Hokkaido University, Sapporo 060-0814, Japan.
Publisher Copyright:
© 2017 IEEE.
PY - 2018/4
Y1 - 2018/4
N2 - This paper presents the thermal and electromagnetic behaviors of multistacked no-insulation (NI) REBa2Cu3O7-x (REBCO, RE = rare earth) pancake coils. The NI winding technique gives a high enough thermal stability not to damage REBCO coils even though a normal-state transition occurs. The high thermal stability has been verified through overcurrent tests. Moreover, the numerical simulation of multistacked NI REBCO pancake coils has been performed to investigate the electromagnetic behaviors in detail. The simulation results also confirmed the high thermal stability of NI REBCO pancake coils. However, it does not mean that an NI REBCO magnet never quenches. In experiments, it was observed that a quench in one of the pancake coils propagated to the other pancake coils sequentially. The above sequential quench from pancake to pancake has not been confirmed in the numerical simulation since the thermal behavior is not considered. For the more reliable verification, we have developed a numerical simulation to investigate the thermal and electromagnetic behaviors by the partial element equivalent circuit method and the two-dimensional thermal finite-element method. In this paper, the six-stacked NI REBCO pancake coil is simulated with several operating temperatures, and the sequential quench is reproduced. The velocity of the sequential quench is also shown.
AB - This paper presents the thermal and electromagnetic behaviors of multistacked no-insulation (NI) REBa2Cu3O7-x (REBCO, RE = rare earth) pancake coils. The NI winding technique gives a high enough thermal stability not to damage REBCO coils even though a normal-state transition occurs. The high thermal stability has been verified through overcurrent tests. Moreover, the numerical simulation of multistacked NI REBCO pancake coils has been performed to investigate the electromagnetic behaviors in detail. The simulation results also confirmed the high thermal stability of NI REBCO pancake coils. However, it does not mean that an NI REBCO magnet never quenches. In experiments, it was observed that a quench in one of the pancake coils propagated to the other pancake coils sequentially. The above sequential quench from pancake to pancake has not been confirmed in the numerical simulation since the thermal behavior is not considered. For the more reliable verification, we have developed a numerical simulation to investigate the thermal and electromagnetic behaviors by the partial element equivalent circuit method and the two-dimensional thermal finite-element method. In this paper, the six-stacked NI REBCO pancake coil is simulated with several operating temperatures, and the sequential quench is reproduced. The velocity of the sequential quench is also shown.
KW - FEM
KW - PEEC model
KW - no-insulation REBCO pancake coil
KW - quench protection
KW - thermal stability
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U2 - 10.1109/TASC.2017.2781240
DO - 10.1109/TASC.2017.2781240
M3 - Article
AN - SCOPUS:85038381519
VL - 28
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
SN - 1051-8223
IS - 3
M1 - 8170264
ER -