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Design of a new toroidal shell and support structure for RFX

W Baker, S Dal Bello, D Marcuzzi, P Sonato, P Zaccaria2002年Fusion Engineering and DesignIF 1.7出版社

AbstractThe physics results obtained from RFP experiments at high current (0.8–1 MA) indicate the need for a better control of the plasma MHD modes, which grow rapidly and lock to the wall during the pulse. The modifications planned for the RFX machine have been designed to guarantee both a passive and an active control of these modes. The present 65 mm thick aluminium shell will be replaced by a 3 mm thick copper shell which is assembled on the vacuum vessel, closer to the plasma edge. In addition 192 saddle coils will be installed to actively control the main mode spectrum of RFX. As a result of these modifications, a new toroidal support structure will be required, which carries out the mechanical functions of the previous shell and supports the new saddle coils. This paper deals with the design of the thin shell and toroidal structure. The solutions which guarantee the required safety level, from a mechanical and thermal point of view, and the technological details of the electrical insulation systems for the various components are highlighted.

日本語訳

RFP実験(0.8〜1 MA)から得られた物理的結果は、パルス中に急速に成長し壁にロックするプラズマMHDモードのより良い制御の必要性を示している。RFX装置に計画された改造は、これらのモードの受動的および能動的制御の両方を保証するように設計されている。現在の厚さ65 mmのアルミニウムシェルは、プラズマ端により近い真空容器上に組み立てられる厚さ3 mmの銅シェルに置き換えられる。さらに、RFXの主要モードスペクトルを能動的に制御するために、192個のサドルコイルが設置される。これらの改造の結果として、従来のシェルの機械的機能を担い、新しいサドルコイルを支持する新しいトロイダル支持構造が必要となる。本論文は、薄肉シェルとトロイダル構造の設計を扱う。機械的および熱的観点から必要な安全レベルを保証する解決策と、各種コンポーネントの電気絶縁システムの技術的詳細が強調される。

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