TY - JOUR
T1 - Numerical Evaluation of Screening Current-Induced Magnetic Field Considering Variable Output Energy in REBCO Coil System of Skeleton Cyclotron for Cancer Therapy
AU - Ogata, Takamitsu
AU - Shirai, Kodai
AU - Ishiyama, Atsushi
AU - Ueda, Hiroshi
AU - Noguchi, So
AU - Watanabe, Tomonori
AU - Nagaya, Shigeo
AU - Fukuda, Mitsuhiro
N1 - Funding Information:
Manuscript received November 29, 2020; revised February 2, 2021; accepted February 12, 2021. Date of publication February 16, 2021; date of current version March 12, 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: Atsushi Ishiyama.) Takamitsu Ogata, Kodai Shirai, and Atsushi Ishiyama are with the Department of Electrical Engineering and Bioscience, Waseda University, Tokyo 169-8555, Japan (e-mail: takaogata@asagi.waseda.jp; atsushi@waseda.jp). Hiroshi Ueda is with the Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan. So Noguchi is with the Graduate School of Information Science and Technology, Hokkaido University, Sapporo 060-0814, Japan. Tomonori Watanabe and Shigeo Nagaya are with the Chubu Electric Power Company, Nagoya 459-8522, Japan. Mitsuhiro Fukuda is with the M Research Center for Nuclear Physics, Osaka University, Osaka 567-0047, Japan. Color versions of one or more figures in this article are available at https: //doi.org/10.1109/TASC.2021.3059725. Digital Object Identifier 10.1109/TASC.2021.3059725
Publisher Copyright:
© 2002-2011 IEEE.
PY - 2021/8
Y1 - 2021/8
N2 - We have been developing a new-generation accelerator named 'Skeleton Cyclotron', which is an ultra-compact and high-intensity accelerator for the stable production of 211At used for targeted alpha-particle therapy. Coil system for Skeleton Cyclotron consists of circular and noncircular high-temperature superconducting magnets and it can cause the output energy to vary without being bounded by the non-linearity of the iron core. This will enable not only the production of 211At, but also the production of radioisotopes for positron emission tomography and neutron irradiation for boron neutron capture therapy with a single accelerator. A high-precision magnetic field distribution and a high temporal stability are required for stable beam acceleration, but the screening current, which is induced in the REBa2Cu3Ox (REBCO, RE: Rare Earth) coated conductor, generates an irregular magnetic field and deteriorates the quality of the magnetic field spatially and temporally. In this study, we numerically evaluated the temporal stability and reproducibility of the screening current-induced field considering the variable energy operation for the Ultra-Baby Skeleton Cyclotron, which is a small demonstration model of Skeleton Cyclotron.
AB - We have been developing a new-generation accelerator named 'Skeleton Cyclotron', which is an ultra-compact and high-intensity accelerator for the stable production of 211At used for targeted alpha-particle therapy. Coil system for Skeleton Cyclotron consists of circular and noncircular high-temperature superconducting magnets and it can cause the output energy to vary without being bounded by the non-linearity of the iron core. This will enable not only the production of 211At, but also the production of radioisotopes for positron emission tomography and neutron irradiation for boron neutron capture therapy with a single accelerator. A high-precision magnetic field distribution and a high temporal stability are required for stable beam acceleration, but the screening current, which is induced in the REBa2Cu3Ox (REBCO, RE: Rare Earth) coated conductor, generates an irregular magnetic field and deteriorates the quality of the magnetic field spatially and temporally. In this study, we numerically evaluated the temporal stability and reproducibility of the screening current-induced field considering the variable energy operation for the Ultra-Baby Skeleton Cyclotron, which is a small demonstration model of Skeleton Cyclotron.
KW - Cyclotrons
KW - high-temperature superconductors
KW - nuclear medicine
KW - superconducting magnets
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U2 - 10.1109/TASC.2021.3059725
DO - 10.1109/TASC.2021.3059725
M3 - Article
AN - SCOPUS:85100935009
SN - 1051-8223
VL - 31
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 5
M1 - 9354981
ER -
