A spectroscopic inference and SOLPS-ITER comparison of flux-resolved edge plasma parameters in detachment experiments on TCV
A spectroscopic inference and SOLPS-ITER comparison of flux-resolved edge plasma parameters in detachment experiments on TCV
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DOI：
10.1088/1741-4326/ac7813
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发表时间：
2022-06
期刊：
影响因子：
3.3
通讯作者：
A. Perek;M. Wensing;Kevin Verhaegh;B. Linehan;H. Reimerdes;C. Bowman;M. van Berkel;I. Classen;B. Duval;O. Février;J. Koenders;T. Ravensbergen;C. Theiler;M. D. de Baar
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文献类型：
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作者：
A. Perek;M. Wensing;Kevin Verhaegh;B. Linehan;H. Reimerdes;C. Bowman;M. van Berkel;I. Classen;B. Duval;O. Février;J. Koenders;T. Ravensbergen;C. Theiler;M. D. de Baar
这项工作介绍了使用碰撞-辐射模型来推断等离子体参数从几条重气巴尔默谱线的二维发射率。发射率是由MANTIS获得的，这是一种绝对校准的十摄像头成像多色仪，空间分辨率为<；5 mm，最高帧速率为800赫兹，可沿切线查看较低的偏滤器。我们对这些图像帧的分析生成了等离子体参数的2D图，如电子密度、温度、中性原子密度以及作为时间函数的电离、复合和电荷交换的反应速率。将该分析与考虑漂移的SOLP-ITER模拟进行了比较和验证。将结果与二维、径向和极向分布的模拟结果进行了比较，以探讨粒子在刮除层中的传输的众多影响，特别是在偏滤器支腿分离的情况下。推测的内偏滤器支路的电子密度和温度的径向分布与SOLP-ITER的预测是一致的。在实验上发现了粒子向私有通量区域的显著传输，但在模拟中没有捕捉到。模拟结果与在外偏滤器靶处的实验结果不一致，其中等离子体发射与等离子体-分子相互作用驱动的发射是一致的。我们的分析还显示了通过潜在地提供对偏滤器中粒子平衡的光学跟踪来辅助功率排放控制努力的前景。
This work presents the use of a collisional-radiative model to infer plasma parameters from 2D emissivities of several deuterium Balmer lines. The emissivities were obtained by MANTIS, an absolutely calibrated, ten-camera imaging polychromator with <5mm spatial resolution, up to 800 Hz frame rate, viewing the lower divertor tangentially. Our analysis of those image frames generates 2D maps of plasma parameters such as electron density, temperature, neutral atomic density and the reaction rates for ionisation, recombination and charge exchange as a function of time. The analysis is compared and validated against a SOLPS-ITER simulation accounting for drifts. The results are compared against the simulation in 2D, radial and poloidal profiles to probe the numerous effects of particle transport in the scrape-off layer, in particular in the approach to detached divertor leg conditions. The inferred inner divertor leg radial profiles of the electron density and temperature were consistent with the SOLPS-ITER predictions. A significant transport of particles to the private flux region is found experimentally, that is not captured in the simulation. The simulation diverges from the experiment at the outer divertor target, where the plasma emission appears to be consistent with the emission driven by plasma–molecule interactions. Our analysis also shows prospects for aiding the power exhaust control efforts by potentially providing an optical tracking of the particle balance in the divertor.