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First EMC3-Eirene simulations of the TCV snowflake divertor

T Lunt, G P Canal, Y Feng, H Reimerdes, B P Duval, B Labit, W A J Vijvers, D Coster, K Lackner, M Wischmeier2014年Plasma Physics and Controlled FusionIF 2.2出版社

One of the approaches to solve the heat load problem in a divertor tokamak is the so called 'snowflake' (SF) configuration, a magnetic equilibrium with two nearby x-points and two additional divertor legs. Here we report on the first EMC3-Eirene simulations of plasma- and neutral particle transport in the scrape-off layer of a series of TCV SF equilibria with different values of σ, the distance between the x-points normalized to the minor radius of the plasma. The constant cross-field transport coefficients were chosen such that the power- and particle deposition profiles at the primary inner strike point (SP) match the Langmuir probe measurements for the σ = 0.1 case. At the secondary SP on the floor, however, a significantly larger power flux than that predicted by the simulation was measured by the probes, indicating an enhanced transport across the primary separatrix. As the ideal SF configuration (σ = 0) is approached, the density as well as the radiation maximum are predicted to move from the target plates upward to the x-point by the simulation.

日本語訳

ダイバータ・トカマクにおける熱負荷問題を解決するためのアプローチの一つが、いわゆる「スノーフレーク」(SF)配位であり、これは2つの近接したX点と2つの追加ダイバータ脚を有する磁気平衡である。本論文では、プラズマのマイナー半径で規格化したX点間距離σの異なる一連のTCV SF平衡におけるスクレイプオフ層内のプラズマおよび中性粒子輸送について、初のEMC3-Eireneシミュレーションを報告する。断面方向輸送係数は、σ = 0.1の場合のラングミュアプローブ測定による一次内側ストライク点(SP)での電力および粒子堆積分布と一致するように選定された。しかし、床面の二次SPでは、プローブによる測定でシミュレーション予測よりも有意に大きな電力フラックスが観測され、一次セパラトリクスを横切る輸送の増大が示唆された。理想的なSF配位(σ = 0)に近づくにつれ、密度および放射の最大値はターゲット板から上方のX点へ移動することがシミュレーションによって予測された。

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