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Plans for the first plasma operation of Wendelstein 7-X

T. Sunn Pedersen, T. Andreeva, H.-S. Bosch, S. Bozhenkov, F. Effenberg, M. Endler, Y. Feng, D.A. Gates, J. Geiger, D. Hartmann2015年被引用 67Nuclear FusionIF 3出版社

Wendelstein 7-X (W7-X) is currently under commissioning in preparation for its initial plasma operation phase, operation phase 1.1 (OP1.1). This first phase serves primarily to provide an integral commissioning of all major systems needed for plasma operation, as well as systems, such as diagnostics, that need plasma operation to verify their foreseen functions. In OP1.1, W7-X will have a reduced set of in-vessel components. In particular, five graphite limiter stripes replace the later foreseen divertor. This paper describes the expected machine capabilities in OP1.1, as well as a selection of physics topics that can be addressed in OP1.1, despite the simplified configuration and the reduced machine capabilities. Physics topics include the verification and adjustment of the magnetic topology, the testing of the foreseen plasma start-up scenarios and the feed-forward control of plasma density and temperature evolution, as well as more advanced topics such as scrape-off layer (SOL) studies at short connection lengths and transport studies. Plasma operation in OP1.1 will primarily be performed in helium, with a hydrogen plasma phase at the end.

日本語訳

Wendelstein 7-X(W7-X)は現在、初期プラズマ運転フェーズである運転フェーズ1.1(OP1.1)に向けたコミッショニング中である。この最初のフェーズは、プラズマ運転に必要なすべての主要システムの統合コミッショニングを提供することを主な目的としており、また、プラズマ運転を必要とする診断システムなどの検証も含まれる。OP1.1では、W7-Xは炉内コンポーネントを限定した構成となる。特に、後に設置されるダイバータの代わりに、5つのグラファイトリミタストリップが設置される。本論文では、簡素化された構成と限られたマシン能力にもかかわらず、OP1.1で達成可能なマシン性能の予測と、そこで取り組むことができる物理トピックの選定について述べる。物理トピックには、磁場トポロジーの検証と調整、計画されたプラズマ立ち上げシナリオの試験、プラズマ密度と温度の時間発展のフィードフォワード制御、さらに、短い接続長でのスクレイプオフ層(SOL)研究や輸送研究などのより高度なトピックが含まれる。OP1.1でのプラズマ運転は主にヘリウムで行われ、最後に水素プラズマフェーズが実施される。

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