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ECRH-assisted plasma start-up with toroidally inclined launch: multi-machine comparison and perspectives for ITER

J. Stober, G.L. Jackson, E. Ascasibar, Y.-S. Bae, J. Bucalossi, A. Cappa, T. Casper, M.-H. Cho, Y. Gribov, G. Granucci2011年被引用 55Nuclear FusionIF 3出版社

Electron cyclotron resonance heating (ECRH)-assisted plasma breakdown is foreseen with full and half magnetic field in ITER. As reported earlier, the corresponding O1- and X2-schemes have been successfully used to assist pre-ionization and breakdown in present-day devices. This contribution reports on common experiments studying the effect of toroidal inclination of the ECR beam, which is ⩾20° in ITER. All devices could demonstrate successful breakdown assistance for this case also, although in some experiments the necessary power was almost a factor of 2 higher compared with perpendicular launch. Differences between the devices with regard to the required power and vertical field are discussed and analysed. In contrast to most of these experiments, ITER will build up loop voltage prior to the formation of the field null due to the strong shielding by the vessel. Possible consequences of this difference are discussed.

日本語訳

電子サイクロトロン共鳴加熱(ECRH)支援によるプラズマ・ブレークダウンは、ITERにおいて全磁場および半磁場で想定されている。既に報告されているように、対応するO1およびX2スキームは、現在の装置において予備電離とブレークダウンを支援するために首尾よく使用されてきた。本寄稿は、ITERでは20°以上であるECRビームのトロイダル傾斜の効果を研究する共通実験について報告する。すべての装置がこの場合についてもブレークダウン支援の成功を実証できたが、いくつかの実験では必要なパワーが垂直入射と比較してほぼ2倍高かった。必要なパワーと鉛直磁場に関する装置間の差異が議論され、分析される。これらの実験のほとんどとは対照的に、ITERでは、容器による強い遮蔽のため、磁場零点の形成に先立ってループ電圧が立ち上がるであろう。この差異の考えられる結果が議論される。

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ITERElectron cyclotron heatingPlasma start-up
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