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SOLPS simulations of detachment in a snowflake configuration for the future upper divertor in ASDEX Upgrade

O Pan, T Lunt, M Wischmeier, D Coster, the ASDEX Upgrade team2018年Plasma Physics and Controlled FusionIF 2.2出版社

We report on the first SOLPS simulations of a low-field side snowflake minus (LFS SF−) configuration in ASDEX Upgrade (AUG). This configuration will become accessible in AUG after the foreseen hardware modification of its upper divertor. Spatially constant transport coefficients, an input power of 5 MW and a nitrogen seeding rate leading to a radiative fraction of 86% were assumed. This radiative fraction is 9% higher than that for a single null reference with the same transport coefficients, similar upstream parameters and separatrix impurity concentrations. As a consequence the LFS SF− configuration achieves a larger degree of detachment and reduced heat fluxes to the targets. This heat flux mitigation was found to be significantly stronger than that expected from a simple scrape-off layer splitting model.

日本語訳

我々は、ASDEX Upgrade(AUG)における低磁場側スノーフレークマイナス(LFS SF−)配位の初のSOLPSシミュレーションについて報告する。この配位は、上部ダイバータの想定されたハードウェア改造後にAUGで利用可能となる予定である。空間的に一定の輸送係数、5 MWの入力パワー、および86%の放射割合をもたらす窒素シーディング率を仮定した。この放射割合は、同じ輸送係数、同様の上流パラメータ、およびセパラトリックス不純物濃度を持つ単一ヌル基準配位と比較して9%高い。その結果、LFS SF−配位はより大きなデタッチメントの程度を達成し、ターゲットへの熱流束を低減する。この熱流束低減は、単純なスクレイプオフ層分割モデルから予想されるものよりも有意に強いことが判明した。

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asdex-upgrade高精度(タイトル一致)

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DivertorASDEXASDEX UpgradeDivertor detachmentScrape-Off Layer Plasma Simulation
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