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Dynamics of dust events in the graphite first wall equipped SST-1 tokamak

Santanu Banerjee, Shwetang N Pandya, R Manchanda, M B Chowdhuri, N Ramaiya, Santosh P Pandya, J Ghosh, the SST-1 team2018年Plasma Physics and Controlled FusionIF 2.2出版社

Dust events are recorded in the SST-1 tokamak with fast visible imaging and infrared imaging systems. The events are analyzed from the image sequences with an in-house developed dust tracking routine in MATLAB called FINDUST. Specific operating scenarios for dust observation and their deleterious effects on discharge evolution are identified. A clear correlation of the dust events frequency and strength with the successful start-up and discharge evolution is observed over eight consecutive experimental campaigns in SST-1. It has been seen that the electron cyclotron resonance heating (ECRH) generated pre-ionization slab annular-plasma around the fundamental layer is most likely to generate dust, while the strongest effect of the ECRH fundamental layer on the plasma facing components is seen when the confined plasma column disrupts by some means while the ECRH pulse is still ON.

日本語訳

ダスト事象は、SST-1トカマクにおいて高速可視イメージングシステムおよび赤外線イメージングシステムを用いて記録される。これらの事象は、MATLABで開発された社内ダスト追跡ルーチンであるFINMATLABを用いて、画像シーケンスから解析される。ダスト観測のための具体的な運転シナリオと、放電進展に対するそれらの有害な影響が特定される。SST-1における8回の連続した実験キャンペーンを通じて、ダスト事象の頻度および強度と、放電立ち上げの成功および放電進展との間に明確な相関関係が観測される。電子サイクロトロン共鳴加熱(ECRH)によって生成された予備電離スラブ状環状プラズマが基本層付近でダストを最も生成しやすい一方、ECRHパルスが印加されたままの状態で閉じ込めプラズマ柱が何らかの手段で崩壊する際に、ECRH基本層がプラズマ対向部品に及ぼす影響が最も強くなることが見出された。

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