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arXiv 1306.4605physics.ins-dethep-ex
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百万分之一级溶解氮对液氩闪烁光吸收的测量

A Measurement of the Absorption of Liquid Argon Scintillation Light by Dissolved Nitrogen at the Part-Per-Million Level

B. J. P. Jones, C. S. Chiu, J. M. Conrad, C. M. Ignarra, T. Katori, M. Toups

摘要:

我们报告的闪烁光的吸收长度的测量,由于溶解氮在百万分之一(ppm)的水平。我们将受控量的氮气注入到高纯度的液态氩中,并监测来自α源的光输出。源被放置在离低温光电倍增管组件不同的距离处。通过比较每个位置的光输出,我们提取了氮的吸收截面。我们发现,氮吸收氩闪烁光的强度为$(1.51\pm 0.15)\times10^{-4} \;\mathrm{cm^{-1} ppm^{-1}}$,相应的吸收截面为$(7.14 \pm 0.74)\times10^{-21}\;\mathrm{cm^{2} molecule^{-1}}$。我们得到的吸收长度和氮浓度之间的关系在0至50 ppm的范围内,并讨论了未来的大型液氩时间投影室(LArTPC)探测器的设计和数据分析的影响。我们的研究结果表明,对于当前一代的LArTPC,其中的浓度为百万分之二的氮是预期的,由于氮的衰减长度将是$30 \pm 3$米。

英文摘要:

We report on a measurement of the absorption length of scintillation light in liquid argon due to dissolved nitrogen at the part-per-million (ppm) level. We inject controlled quantities of nitrogen into a high purity volume of liquid argon and monitor the light yield from an alpha source. The source is placed at different distances from a cryogenic photomultiplier tube assembly. By comparing the light yield from each position we extract the absorption cross section of nitrogen. We find that nitrogen absorbs argon scintillation light with strength of $(1.51\pm 0.15)\times10^{-4} \;\mathrm{cm^{-1} ppm^{-1}}$, corresponding to an absorption cross section of $(7.14 \pm 0.74)\times10^{-21}\;\mathrm{cm^{2} molecule^{-1}}$. We obtain the relationship between absorption length and nitrogen concentration over the 0 to 50 ppm range and discuss the implications for the design and data analysis of future large liquid argon time projection chamber (LArTPC) detectors. Our results indicate that for a current-generation LArTPC, where a concentration of 2 parts per million of nitrogen is expected, the attenuation length due to nitrogen will be $30 \pm 3$ meters.

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