| アイテムタイプ |
学術雑誌論文 / Journal Article(1) |
| 公開日 |
2023-07-03 |
| タイトル |
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タイトル |
Thermal characteristics of a helium-free superconducting magnet system for a fast-ramping heavy-ion synchrotron |
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言語 |
en |
| 言語 |
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言語 |
eng |
| 資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
journal article |
| 著者 |
Yang Ye
Mizushima Kota
Matsuba Shunya
Fujimoto Tetsuya
Noda Etsuo
Urata Masami
Shirai Toshiyuki
Shigeki Takayama
Saki Amano
Tomofumi Orikasa
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| 抄録 |
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内容記述タイプ |
Abstract |
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内容記述 |
A compact synchrotron has been proposed for the next generation heavy-ion therapy system at the National Institutes for Quantum Science and Technology (QST). In this synchrotron, four 90-degree superconducting bending magnets designed on the basis of the superconducting magnet for the rotating-gantry currently operated at QST are adopted to achieve a compact size. These NbTi superconducting bending magnets are conduction-cooled by several Gifford?McMahon (GM) cryocoolers and are designed to generate both the dipole field of 3.5 T and the quadrupole field of 1.5 T/m to operate at a ramp rate of 0.7 T/s. It is a challenge to remove the heat generated from AC losses at such a fast ramp rate, and keep the superconducting magnets from quenching during the continuous operation without using liquid helium. In this paper, we studied the feasibility for realizing a fast-ramping synchrotron by using a helium-free superconducting magnet system for heavy-ion therapy. Using the numerical models, we estimated the AC losses including eddy current loss in mechanical structures, iron loss and loss in superconductor to be about 212 J in a cycle duration of 20 s for each 90-degree superconducting bending magnet, and it was possible to eliminate that amount of AC losses by using GM cryocoolers. To validate the transient temperature rising during the continuous operation, a dynamic simulation was performed using the estimated AC losses as input, and the peak temperature at thermal equilibrium was evaluated to be lower than 5 K for a practical operation scenario of heavy-ion therapy irradiation. |
| 書誌情報 |
Cryogenics
巻 126,
p. 103524,
発行日 2022-09
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| 出版者 |
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出版者 |
Elsevier |
| ISSN |
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収録物識別子タイプ |
ISSN |
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収録物識別子 |
0011-2275 |
| DOI |
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識別子タイプ |
DOI |
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関連識別子 |
10.1016/j.cryogenics.2022.103524 |
