TY - JOUR
T1 - Numerical Evaluation on Quench Behavior of No-Insulation REBCO Coil System in Small-Scale Model of Skeleton Cyclotron
AU - Nakai, Yuki
AU - Miyake, Yuta
AU - Inoue, Ryota
AU - Kim, Seok Beom
AU - Ueda, Hiroshi
AU - Noguchi, So
AU - Watanabe, Tomonori
AU - Nagaya, Shigeo
AU - Fukuda, Mitsuhiro
AU - Ishiyama, Atsushi
N1 - Publisher Copyright:
© 2002-2011 IEEE.
PY - 2022/9/1
Y1 - 2022/9/1
N2 - We have proposed a cyclotron for cancer therapy, called Skeleton Cyclotron, which is based on non-insulation (NI) high temperature superconducting (HTS) technology. The Skeleton Cyclotron consists of circular main coils for the isochronous field and non-circular sector coils for the azimuthally varying field (AVF). In order to establish the development technology of HTS multi-coil system for the skeleton cyclotron, we have now designed a small half-size multi-coil system for demonstration, called Ultra-Baby Cyclotron, at the operating current of 540 A, the operating temperature of 20 K and the magnetic field of 1.6 T at the extraction radius of 0.2 m. The NI HTS coil can make both high current density and high magnetic field, so it can achieve miniaturization of its size and high intensity beams. Furthermore, in NI coils, the current flows not only in the coil winding direction but also in the radial direction. Therefore, even if the local normal transition occurs in the coil windings, the current can bypass into the neighboring wires and thermal stability can be improved. On the other hand, when the normal transition and quench occur, the electromagnetic and mechanical behaviors in NI coils are different from those of conventional insulated coil. Therefore, we developed a current distribution analysis code for non-insulation HTS coils and simulated the current distributions during the normal transition and quench in NI REBCO coil system for Skeleton Cyclotron.
AB - We have proposed a cyclotron for cancer therapy, called Skeleton Cyclotron, which is based on non-insulation (NI) high temperature superconducting (HTS) technology. The Skeleton Cyclotron consists of circular main coils for the isochronous field and non-circular sector coils for the azimuthally varying field (AVF). In order to establish the development technology of HTS multi-coil system for the skeleton cyclotron, we have now designed a small half-size multi-coil system for demonstration, called Ultra-Baby Cyclotron, at the operating current of 540 A, the operating temperature of 20 K and the magnetic field of 1.6 T at the extraction radius of 0.2 m. The NI HTS coil can make both high current density and high magnetic field, so it can achieve miniaturization of its size and high intensity beams. Furthermore, in NI coils, the current flows not only in the coil winding direction but also in the radial direction. Therefore, even if the local normal transition occurs in the coil windings, the current can bypass into the neighboring wires and thermal stability can be improved. On the other hand, when the normal transition and quench occur, the electromagnetic and mechanical behaviors in NI coils are different from those of conventional insulated coil. Therefore, we developed a current distribution analysis code for non-insulation HTS coils and simulated the current distributions during the normal transition and quench in NI REBCO coil system for Skeleton Cyclotron.
KW - Cyclotrons
KW - high temperature superconductors
KW - non-insulation
KW - superconducting magnets
UR - http://www.scopus.com/inward/record.url?scp=85130453248&partnerID=8YFLogxK
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U2 - 10.1109/TASC.2022.3174811
DO - 10.1109/TASC.2022.3174811
M3 - Article
AN - SCOPUS:85130453248
SN - 1051-8223
VL - 32
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 6
M1 - 4006605
ER -
