| アイテムタイプ |
学術雑誌論文 / Journal Article(1) |
| 公開日 |
2025-04-01 |
| タイトル |
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|
タイトル |
Investigation of preferable pressure and current density profiles for improving no-wall MHD stability of tokamak DEMO reactor including self-consistent bootstrap current calculations |
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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 |
Y. Masamoto
M. Furukawa
Aiba Nobuyuki
M. Honda
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| 抄録 |
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内容記述タイプ |
Abstract |
|
内容記述 |
The parameter settings for JA DEMO 2014 was found to be close to the ideal magnetohydrodynamics (MHD) stability limit. Therefore, this study investigated the trend in the preferable current density and pressure profiles to improve the ideal MHD stability of equilibria with high-confinement-mode pedestals and internal transport barriers (ITBs). Optimum density and temperature profiles were determined in the pedestal region based on EPED1 model, and the optimized profiles were utilized to investigate the preferable profiles in the core region. The MHD equilibrium calculations included bootstrap currents that were consistent with density and temperature profiles. Since a stabilizing effect by a perfectly conducting wall was not considered, stable equilibria found in this study require no feedback control of resistive wall modes. Effects of changing the aspect ratio on the ideal MHD stability properties were also examined. The ITB was found to have a preferable radial position, that realized both a higher volume-averaged beta and the decoupling of the instability in the core and pedestal regions, respectively. Moreover, it was found that the beta limit could be increased if the current density profile could be controlled so that a larger magnetic shear was realized in the ITB region. The pedestal height was better reduced from the marginally stable cases to avoid easy coupling with the driving force of instabilities in the core region. These properties were common for all aspect ratios examined. Moreover, the normalized beta limit under the no-wall condition was approximately 3 for the examined aspect ratios, which was higher than the target value 2.6 of the pulsed operations of JA DEMO 2014. |
| 書誌情報 |
Fusion Engineering and design
巻 213,
p. 114841,
発行日 2025-04
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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 |
0920-3796 |
| DOI |
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識別子タイプ |
DOI |
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関連識別子 |
10.1016/j.fusengdes.2025.114841 |
