ArDM LAr TPC氩闪烁光衰减长度的测量
Measurement of the attenuation length of argon scintillation light in the ArDM LAr TPC
摘要：
本文报道了ArDM暗物质实验中吨级液氩靶中闪烁光衰减长度的测量结果。数据记录在实验的第一次地下操作中，以单相操作模式进行。通过比较来自39-Ar和83 m-Kr的光产额光谱与具有全光线追踪模型的ArDM设置的描述来实现结果。一个相对较低的值接近0.5米被发现的衰减长度的液氩散装到自己的闪烁光。我们将此结果解释为液态氩中存在光学活性杂质，这些杂质未被安装的纯化系统过滤。我们还提出了用于填充的氩气的分析，并讨论了各种分子在真空紫外线中的截面，以满足大型液氩装置的纯度要求。
英文摘要：
We report on a measurement of the attenuation length for the scintillation light in the tonne size liquid argon target of the ArDM dark matter experiment. The data was recorded in the first underground operation of the experiment in single-phase operational mode. The results were achieved by comparing the light yield spectra from 39-Ar and 83m-Kr to a description of the ArDM setup with a model of full light ray tracing. A relatively low value close to 0.5 m was found for the attenuation length of the liquid argon bulk to its own scintillation light. We interpret this result as a presence of optically active impurities in the liquid argon which are not filtered by the installed purification systems. We also present analyses of the argon gas employed for the filling and discuss cross sections in the vacuum ultraviolet of various molecules in respect to purity requirements in the context of large liquid argon installations.
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