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Numerical investigation of toroidal plasma response for ELM control via magnetic perturbations in the DTT Tokamak

L. Pigatto, T. Bolzonella, M. Bonotto, V. Fusco, Y.Q. Liu, G. Marchiori, F. Villone, G. Vlad2024年Nuclear FusionIF 3出版社

Linear plasma response modeling is exploited in this work to assess the effect of different coil configurations on edge localized mode (ELM) stability in full power operational scenarios for the Divertor Tokamak Test (DTT) facility, presently under construction at the ENEA site of Frascati (Italy). The MARS-F code is used to compute, in toroidal geometry and including flow, the resistive plasma response to different vacuum fields with toroidal mode numbers . Peeling-like response in particular, correlated with ELM control, is found to be significant for perturbations while induces a large core response in the investigated scenarios. Two metrics are used to link plasma response to ELM control. Namely the local normal plasma displacement in the x-point region and the Chirikov parameter in PEST-like straight-field-line coordinates. These criteria are used to predict optimal phasing of the active coil arrays and current thresholds based on empirical evidence. Depending on the number of active coils and on the scenario, coil currents between 20 and 40 kAt are predicted to be effective for ELM mitigation in DTT.

日本語訳

本稿では、線形プラズマ応答モデリングを用いて、現在イタリアのフラスカティにあるENEA敷地内で建設中のDivertor Tokamak Test (DTT)施設のフルパワー運転シナリオにおける、エッジ局在モード(ELM)安定性に対する異なるコイル配位の影響を評価する。MARS-Fコードを用いて、トロイダル幾何学において、流れを含めて、トロイダルモード数 を持つ異なる真空磁場に対する抵抗性プラズマ応答を計算する。特にELM制御と相関するピーリング様応答は、 摂動に対して顕著であることが見出され、一方 は調査したシナリオにおいて大きなコア応答を誘起する。プラズマ応答とELM制御を関連付けるために、2つの指標が用いられる。すなわち、x点領域における局所的な法線プラズマ変位と、PEST類似の直線磁力線座標におけるChirikovパラメータである。これらの基準は、経験的証拠に基づいて、能動コイルアレイの最適な位相と電流閾値を予測するために用いられる。能動コイルの数とシナリオに応じて、20~40 kAtのコイル電流がDTTにおけるELM緩和に有効であると予測される。

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Edge localized modeMagnetic perturbationDTTELM control
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