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UEDGE simulation of edge plasmas in DIII-D double null configurations

机译：DIII-D双零位配置中边缘等离子体的UEDGE模拟

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Analysis of plasma flow in the edge of double null hybrid mode DIII-D plasmas is reported. The two dimension fluid plasma code UEDGE [T. Rognlien, J. Nucl. Mater. 196-198, 347 (1992)] is used for the analysis. The effect of impurity radiation from intrinsic carbon sputtered from plasma facing surfaces is included as is the effect of plasma drifts. Two discharges in which the flux surfaces through the poloidal field nulls (X-points) are separated by 1 cm at the outer midplane are analyzed. The discharges differ only in the direction of the ion ?B drift. It is shown that the flow of both primary ions and intrinsic impurities is dominated by the effect of plasma drifts. Variations in the recycling of deuterium ions, as seen in D_α emission profiles, are qualitatively consistent with experiment and are driven by the effect of E×B drifts associated with radial gradients of the electron temperature at the secondary separatrix. Trace argon impurity is introduced to simulate the transport of argon used in the experiment to enhance divertor radiation power. Penetration of the trace argon to the closed field lines depends on the direction of the ion ?B drift, consistent with experiment. The analysis described here includes the effect of a deuterium gas puff to establish the "puff and pump" configuration. The poloidal flow of impurities is a balance between the projection of the parallel flow and poloidal drifts, primarily from E×B. It is shown that the effect of the gas puff is primarily to alter the electron temperature profile and thus affects impurity flow via alteration of E×B drifts, not via entrainment in deuterium ion parallel flow.
机译：报告了双无效混合模式DIII-D等离子体边缘的等离子体流分析。二维流体等离子体代码UEDGE [T. Rognlien，J。Nucl。母校196-198，347（1992）]用于分析。包括从面对等离子体的表面溅射的本征碳产生的杂质辐射的影响，以及等离子体漂移的影响。分析了两个放电，其中穿过极向场零点（X点）的通量表面在外中平面处相距1 cm。放电仅在离子ΔB漂移的方向上不同。结果表明，初级离子和固有杂质的流动均受等离子体漂移的影响。从D_α发射曲线中可以看出，氘离子再循环的变化与实验在质量上是一致的，并且是由E×B漂移的影响驱动的，该漂移与次级分离线的电子温度的径向梯度有关。引入痕量氩杂质以模拟实验中使用的氩的传输，以提高发散器辐射功率。痕量氩气向封闭场线的渗透率取决于离子ΔB漂移的方向，与实验一致。这里描述的分析包括氘气粉扑建立“粉扑和泵”配置的效果。杂质的极化流是平行流的投影和极化漂移之间的平衡，主要来自E×B。结果表明，吹气的作用主要是改变电子温度曲线，从而通过改变E×B漂移而不是通过夹带氘离子平行流来影响杂质流。

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