Application and modeling of an online distillation method to reduce krypton and argon in XENON1T
Application and modeling of an online distillation method to reduce krypton and argon in XENON1T
复制标题
在线蒸馏方法减少 XENON1T 中氪和氩的应用和建模
DOI：
10.1093/ptep/ptac074
复制
发表时间：
2022
影响因子：
3.5
通讯作者：
E. Aprile et al. XENON collaboration
中科院分区：
文献类型：
--
作者：
坂栗佳奈;他;E. Aprile et al. XENON collaboration
XENON1T暗物质实验开发了一种新的在线蒸馏技术，以减少比氙更易挥发的固有背景成分，如氪或氩，而探测器正在运行。该方法基于使用XENON1T低温蒸馏柱对检测器系统的气体体积进行连续纯化。氙中氪浓度为（360 ± 60）ppq。这是迄今为止在运行的暗物质探测器的基准体积中测量到的最低浓度。开发了一个模型，并拟合数据，以描述在550天的时间跨度内，包括XENON1T的调试和科学运行的几种操作模式下，探测器系统的液体和气体体积中的氪演变。在线蒸馏也被成功地应用于去除注入后的37 Ar在XENON1T的低能校准。这使得37Ar在将来作为常规校准源成为可能。在线蒸馏可以应用于下一代液体氙时间投影室实验，以在任何科学运行之前或期间去除氪。这里开发的模型允许进一步优化的蒸馏策略，为未来的大规模检测器。
A novel online distillation technique was developed for the XENON1T dark matter experiment to reduce intrinsic background components more volatile than xenon, such as krypton or argon, while the detector was operating. The method is based on a continuous purification of the gaseous volume of the detector system using the XENON1T cryogenic distillation column. A krypton-in-xenon concentration of (360 ± 60) ppq was achieved. It is the lowest concentration measured in the fiducial volume of an operating dark matter detector to date. A model was developed and fitted to the data to describe the krypton evolution in the liquid and gas volumes of the detector system for several operation modes over the time span of 550 days, including the commissioning and science runs of XENON1T. The online distillation was also successfully applied to remove37Ar after its injection for a low-energy calibration in XENON1T. This makes the usage of37Ar as a regular calibration source possible in the future. The online distillation can be applied to next-generation liquid xenon time projection chamber experiments to remove krypton prior to, or during, any science run. The model developed here allows further optimization of the distillation strategy for future large-scale detectors.