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首页> 外文期刊>Plasma physics and controlled fusion >Evaluation of impurity densities from charge exchange recombination spectroscopy measurements at ASDEX Upgrade
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Evaluation of impurity densities from charge exchange recombination spectroscopy measurements at ASDEX Upgrade

机译：ASDEX升级中电荷交换重组光谱测量中的杂质密度评价

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At ASDEX upgrade (AUG) a new framework for the evaluation of impurity densities based on measurements from charge exchange recombination spectroscopy (CXRS) diagnostics has been developed. The charge exchange impurity concentration analysis code, or CHICA, can perform these calculations for all of the beam-based CXRS diagnostics at AUG and is equipped with the atomic data for all of the regularly measured charge exchange spectral lines (He, Li, B, C, N, O, and Ne). CHICA includes four different methods for the evaluation of the neutral density populations, which feature different implementations and contain varying levels of sophistication. These methods have been thoroughly benchmarked against one another, enabling the important processes for the evaluation of neutral densities to be identified as well as the neutral populations that are most critical to the accurate interpretation of the measured CXRS intensities. For the AUG neutral beams, charge exchange with the ground state of the first energy component is typically the dominant contribution to the measured CXRS intensities, but emission from reactions with the n = 2 beam halo population can contribute up to 35% to the total signal and must be included in the analysis. Neglect of this population leads to incorrect magnitudes and incorrect profile shapes of the calculated impurity density profiles. The edge lines of sight (LOS) of the core CXRS diagnostics at AUG intersect the edge pedestal inside of the neutral beam volume. Therefore, the impurity density is not constant along the LOS, complicating the interpretation of the measured intensities. Within CHICA a forward model for the edge impurity densities has been implemented, enabling the reconstruction of accurate edge profiles.
机译：在ASDEX升级（AUG）上，已经开发了基于电荷交换重组光谱（CXRS）诊断的测量来评估杂质密度的新框架。电荷交换杂质浓度分析代码或奇卡可以在八胡以八峰的所有基于光束的CXRS诊断进行这些计算，并配备了所有定期测量的电荷交换谱线的原子数据（他，李，B， c，n，o和ne）。 Chica包括评估中性密度群的四种不同的方法，该群体具有不同的实施，并含有不同程度的复杂性。这些方法已经彼此彻底基准，使得评估中性密度的重要过程以及对测量的CXR强度的准确解释最关键的中性群体。对于八月中性光束，与第一能量分量的地位的电荷交换通常是对测量的CXRS强度的显性贡献，但与N = 2光束卤素群的反应产生的贡献可以贡献高达35％的总信号并且必须包含在分析中。忽视该群体导致计算出的杂质密度分布的不正确的幅度和不正确的轮廓形状。 AUG的核心CXRS诊断的边缘视线（LOS）与中性光束体积内的边缘基座相交。因此，杂质密度沿洛杉矶不是恒定的，使测量强度的解释复杂化。在Chica中，已经实施了前向杂质密度的前向模型，从而实现了准确的边缘轮廓的重建。

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