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Impact of the passive stabilization system on the dynamic loads of the ITER first wall/blanket during a plasma disruption event

M Ferrari, L Anzidei, V Cristini, G Simbolotti1995年Fusion Engineering and DesignIF 1.7出版社

AbstractIn next-generation tokamak devices (i.e. ITER), passive stabilization of the plasma is required to mitigate the consequences of the plasma vertical displacements and to reduce the occurrence of plasma disruptions. With this aim, two main design approaches have been considered. The first one (adopted in the ITER CDA design) consists of copper stabilization loops (twin loops) attached to box-shaped blanket segments which are electrically and mechanically separated along the toroidal direction. In the second design approach (under consideration for the ITER EDA design), relying on a lower plasma elongation, no specific stabilization loops are required and the passive stabilization is achieved by toroidally continuous components, in particular by the plasma facing wall of the blanket segments, electrically connected along the toroidal direction, thus allowing a toroidal current to flow during the electromagnetic transients. In both cases electrodynamic loads arise in the blanket structures during plasma disruptions and/or vertical displacement events. A comparison between the two design approaches has been carried out from the eddy-current and related load distribution viewpoint.

日本語訳

次世代トカマク装置(すなわちITER)においては、プラズマ垂直変位の影響を緩和し、プラズマディスラプションの発生を低減するために、プラズマの受動安定化が必要とされる。この目的のため、2つの設計アプローチが検討されてきた。第1のアプローチ(ITER CDA設計で採用)は、トロイダル方向に電気的かつ機械的に分離された箱型ブランケットセグメントに取り付けられた銅製安定化ループ(ツインループ)から構成される。第2の設計アプローチ(ITER EDA設計で検討中)では、より低いプラズマ伸長度に依存し、特定の安定化ループを必要とせず、受動安定化はトロイダル方向に連続した構成要素、特にトロイダル方向に電気的に接続されたブランケットセグメントのプラズマ対向壁によって達成され、これにより電磁過渡現象中にトロイダル電流の流れが可能となる。いずれの場合も、プラズマディスラプション事象および/または垂直変位事象中にブランケット構造内で電気力学的荷重が発生する。2つの設計アプローチの比較は、渦電流および関連する荷重分布の観点から実施された。

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ITERPlasma disruptionFirst wall
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