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ELMs mitigation by manipulation of divertor target currents

P.C. Stangeby2003年被引用 8Nuclear FusionIF 3出版社

The very high heat flux density onto divertor targets that occurs during edge localized modes (ELMs) poses problems for the design of burning plasma fusion devices such as ITER. Large (net) currents flow to diverter targets during ELMs. If the current to a target tile is made to pass to machine earth through an external resistor then the plasma potential in the flux tube subtended by that tile will be increased above that in toroidally adjacent flux tubes which are subtended by tiles connected directly to machine earth. Thus, an electric field E perpendicular to B and in the poloidal plane will arise between toroidally adjacent flux tubes resulting in a time-dependant radial E×B drift during the ELM pulse, potentially distributing the energy deposited on the target over a large area. A number of uncertainties in this picture will require experimental resolution.

日本語訳

ELM(周辺局在モード)中に発生するダイバータターゲットへの非常に高い熱流束密度は、ITERのような燃焼プラズマ核融合装置の設計にとって問題となる。ELM中には大きな(正味の)電流がダイバータターゲットに流れる。ターゲットタイルへの電流を外部抵抗を通して機器アースに流すと、そのタイルが張る磁束管内のプラズマ電位は、直接機器アースに接続されたタイルが張るトロイダル方向に隣接する磁束管内の電位よりも上昇する。したがって、Bに垂直でポロイダル面内の電場Eが、トロイダル方向に隣接する磁束管間に生じ、ELMパルス中に時間依存の径方向E×Bドリフトを引き起こし、ターゲットに堆積するエネルギーを広い領域に分散させる可能性がある。この描像には多くの不確実性があり、実験的な解決が必要となる。

装置

iter中精度(概要文一致)

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DivertorEdge localized modeDivertor target
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