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Use of Ar pellet ablation rate to estimate initial runaway electron seed population in DIII-D rapid shutdown experiments

E.M. Hollmann, N. Commaux, R.A. Moyer, P.B. Parks, M.E. Austin, I. Bykov, C. Cooper, N.W. Eidietis, M. O'Mullane, C. Paz-Soldan2017年被引用 12Nuclear FusionIF 3出版社

Small (2–3 mm, 0.9–2 Pa · m3) argon pellets are used in the DIII-D tokamak to cause rapid shutdown (disruption) of discharges. The Ar pellet ablation is typically found to be much larger than expected from the thermal plasma electron temperature alone; the additional ablation is interpreted as being due to non-thermal runaway electrons (REs) formed during the pellet-induced temperature collapse. Simple estimates of the RE seed current using the enhanced ablation rate give values of order 1–10 kA, roughly consistent with estimates based on avalanche theory. Analytic estimates of the RE seed current based on the Dreicer formula tend to significantly underestimate it, while estimates based on the hot tail model significantly overestimate it.

日本語訳

小型(2–3 mm、0.9–2 Pa · m3)アルゴンペレットは、DIII-Dトカマクにおいて放電の急速停止(ディスラプション)を引き起こすために使用される。Arペレットのアブレーションは、典型的には、熱的プラズマ電子温度のみから予想されるよりもはるかに大きいことが見出される;追加のアブレーションは、ペレット誘起の温度崩壊中に形成される非熱的ランナウェイ電子(RE)によるものと解釈される。増強されたアブレーション率を用いたREシード電流の単純な推定は、1–10 kAのオーダーの値を与え、これはアバランシェ理論に基づく推定とおおよそ一致する。Dreicerの式に基づくREシード電流の解析的推定は、それを大幅に過小評価する傾向があり、一方、ホットテールモデルに基づく推定はそれを大幅に過大評価する。

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diii-d高精度(タイトル一致)

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DIII-DRunaway electronAblationPellet ablation
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