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The achievement of the Te,div feedback control by CD4 seeding on EAST

K Wu, Q Yuan, G Xu, L Wang, D Eldon, K Li, X Liu, L Meng, L Zhang, Y Wang2021年Plasma Physics and Controlled FusionIF 2.2出版社

A multi-function divertor feedback control system has been built on Experimental Advanced Superconducting Tokamak (EAST) to treat the divertor heat load issue. With the real-time data of the Langmuir probes and the impurity seeding, the divertor electron temperature (Te,div) is well controlled to achieve the partial detachment phase. The first trial of the CD4 seeding for the Te,div reduction has been achieved on EAST long-pulse discharge. In the seeding phase, the Te,div was maintained close to 5 eV, and the surface temperature of the target plate (Tsurface,div) had a reduction of about 150 °C. The plasma stored energy had a reduction in the control phase, so it is necessary to find a way to keep the good plasma confinement in the next step. The CD4 injection also mitigated the low hybrid wave coupling rate in some degree. The big volume of the CD4 injection lifted the Greenwald density fraction from ∼0.4 to ∼0.7, which made the SOL into high recycling state. Most of the injected carbon particles were in the high ionized state, and with the lower of the Te,div, the tungsten line emission was suppressed obviously.

日本語訳

EASTトカマクにおいて、ダイバータ熱負荷問題に対処するため、多機能ダイバータフィードバック制御システムを構築した。ラングミュアプローブと不純物ガス入射のリアルタイムデータを用いて、ダイバータ電子温度(Te,div)を良好に制御し、部分的なダイバータ非接触状態を達成した。EASTの長時間放電において、Te,div低減のためのCD4ガス入射の初期的な試行に成功した。ガス入射フェーズ中、Te,divは約5 eVに維持され、ターゲット板表面温度(Tsurface,div)は約150 °C低下した。制御フェーズ中にプラズマ蓄積エネルギーが減少したため、次のステップでは良好なプラズマ閉じ込めを維持する方法を見出す必要がある。CD4入射は低ハイブリッド波結合効率も緩和した。大量のCD4入射により、グリーンワルド密度比は約0.4から0.7へ上昇し、スクレイプオフ層(SOL)は高リサイクリング状態となった。入射された炭素粒子の大部分は高電離状態にあり、Te,divの低下に伴い、タングステン線スペクトル発光は明瞭に抑制された。

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