TY - JOUR
T1 - Numerical Evaluation on Electromagnetic and Thermal Stresses in Non-Circular REBCO Pancake Coils of Multi-Coil System for Skeleton Cyclotron
AU - Ueda, Hiroshi
AU - Miyake, Yuta
AU - Awazu, Yuta
AU - Inoue, Ryota
AU - Kim, Seokbeom
AU - Noguchi, So
AU - Watanabe, Tomonori
AU - Nagaya, Shigeo
AU - Fukuda, Mitsuhiro
AU - Ishiyama, Atsushi
N1 - Funding Information:
Manuscript received December 1, 2020; revised February 26, 2021; accepted April 5, 2021. Date of publication April 13, 2021; date of current version May 26, 2021. This work was supported by JST-OPERA, and JSPS Grant-in-Aid for Scientific Research (S) under Grant 18H05244. (Corresponding author: Hiroshi Ueda.) Hiroshi Ueda, Yuta Miyake, Yuta Awazu, Ryota Inoue, and SeokBeom Kim are with the Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan (e-mail: hiroshi.ueda@okayamau.ac.jp; p0pr8zo3@s.okayama-u.ac.jp; ryota.inoue@okayama-u.ac.jp; kim@ec.okayama-u.ac.jp).
Publisher Copyright:
© 2002-2011 IEEE.
PY - 2021/8
Y1 - 2021/8
N2 - We proposed the air-core cyclotron using high-temperature superconducting (HTS) technology, named Skeleton Cyclotron, as high intensity compact, variable-energy and multi-particle cyclotron for RI production. Skeleton Cyclotron consists of HTS split circular main coils generating the isochronous field and HTS non-circular sector coils generating the azimuthally varying field (AVF). Now, we are currently developing the small-scale cryocooler-cooled HTS coil system of Skeleton Cyclotron, which accelerates the proton up to energy of 5 MeV at an extraction radius of 20 cm. Skeleton cyclotron is multi-coil system consists of HTS split circular main NI (no-insulation) coils and HTS non-circular sector NI coils. Therefore, the electromagnetic, thermal, and mechanical behaviors are expected to be very complicated. In this study, the structure analysis based on finite element method using COMSOL Multiphysics is performed for a non-circular sector coil. The coils in Ultra-Baby Cyclotron are reinforced with YOROI-coil structure. Therefore, the effect of YOROI-coil structure was numerically investigated during cool-down process and excitation process. YOROI-coil structure is effective for non-circular sector coil against the electromagnetic force.
AB - We proposed the air-core cyclotron using high-temperature superconducting (HTS) technology, named Skeleton Cyclotron, as high intensity compact, variable-energy and multi-particle cyclotron for RI production. Skeleton Cyclotron consists of HTS split circular main coils generating the isochronous field and HTS non-circular sector coils generating the azimuthally varying field (AVF). Now, we are currently developing the small-scale cryocooler-cooled HTS coil system of Skeleton Cyclotron, which accelerates the proton up to energy of 5 MeV at an extraction radius of 20 cm. Skeleton cyclotron is multi-coil system consists of HTS split circular main NI (no-insulation) coils and HTS non-circular sector NI coils. Therefore, the electromagnetic, thermal, and mechanical behaviors are expected to be very complicated. In this study, the structure analysis based on finite element method using COMSOL Multiphysics is performed for a non-circular sector coil. The coils in Ultra-Baby Cyclotron are reinforced with YOROI-coil structure. Therefore, the effect of YOROI-coil structure was numerically investigated during cool-down process and excitation process. YOROI-coil structure is effective for non-circular sector coil against the electromagnetic force.
KW - Cyclotrons
KW - high-temperature superconductors
KW - nuclear medicine
KW - superconducting magnets
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U2 - 10.1109/TASC.2021.3072871
DO - 10.1109/TASC.2021.3072871
M3 - Article
AN - SCOPUS:85104241039
SN - 1051-8223
VL - 31
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 5
M1 - 9403956
ER -