论文标题
Daya Bay的Juno Liquid Scintillator Pilot实验的替换系统
The replacement system of the JUNO liquid scintillator pilot experiment at Daya Bay
论文作者
论文摘要
江门地下中微子天文台（JUNO）是一种多用途中微子实验，将使用20 kt液体闪烁体（LS）。为了实现确定中微子质量排序的物理目标，需要在1 MEV处进行3 $ \％$的能量分辨率。这对LS的光产量和透明度提出了严格的要求。已经设计了四个LS净化步骤，并在Daya Bay建造了中期植物。为了检查纯化的LS的性能并找到了优化的LS组成，将纯化的LS注入了Daya Bay Neutrino实验的实验厅1（EH1-AD1）中的抗毒剂检测器1。为了抽出原始的Gadolinium装载LS并填充新的LS，在2017年在EH1中构建了LS替换系统。通过用纯净的水更换GD-LS，然后用纯化的LS代替水，替换系统成功实现了设计的目标。随后，通过替换系统将荧光和波长变速子添加到更高的浓度中。在各种LS组成下获取的数据帮助Juno确定了最终的LS鸡尾酒。本文报道了设计，构造和替代系统的操作的细节。
The Jiangmen Underground Neutrino Observatory (JUNO), a multi-purpose neutrino experiment, will use 20 kt liquid scintillator (LS). To achieve the physics goal of determining the neutrino mass ordering, 3$\%$ energy resolution at 1 MeV is required. This puts strict requirements on the LS light yield and the transparency. Four LS purification steps have been designed and mid-scale plants have been built at Daya Bay. To examine the performance of the purified LS and find the optimized LS composition, the purified LS was injected to the antineutrino detector 1 in the experimental hall 1 (EH1-AD1) of the Daya Bay neutrino experiment. To pump out the original gadolinium loaded LS and fill the new LS, a LS replacement system has been built in EH1 in 2017. By replacing the Gd-LS with purified water, then replacing the water with purified LS, the replacement system successfully achieved the designed goal. Subsequently, the fluorescence and the wavelength shifter were added to higher concentrations via the replacement system. The data taken at various LS compositions helped JUNO determine the final LS cocktail. Details of the design, the construction, and the operation of the replacement system are reported in this paper.
