NEWS-G光暗物质搜索实验SPC单电子响应的精确laser基测量
Precision laser-based measurements of the single electron response of SPCs for the NEWS-G light dark matter search experiment
摘要：
球形正比计数器（SPC）是NEWS-G低质量暗物质搜寻实验中采用的一种新型气体探测器技术，它对电离产生的单电子具有很高的灵敏度。在本文中，我们报告的第一个表征的单电子响应的SPC前所未有的精度，使用紫外激光校准系统。的实验方法和分析方法，以及各种直接的应用程序，为即将到来的下一阶段的实验在SNOLAB。其中包括连续监测探测器的响应和电子漂移特性在暗物质搜索运行，以及触发阈值效率的实验测量。我们测量的平均电离能$\mathrm{W}=27.6\pm0.2~\mathrm{eV}$在$\mathrm{Ne + CH_4}$ $(2\%)$为2.8千电子伏的X射线，并证明了在亚千电子伏的能量进行类似的精度测量的可行性，用于未来的气体混合物在SNOLAB的暗物质搜索。
英文摘要：
Spherical Proportional Counters (SPCs) are a novel gaseous detector technology employed by the NEWS-G low-mass dark matter search experiment for their high sensitivity to single electrons from ionization. In this paper, we report on the first characterization of the single electron response of SPCs with unprecedented precision, using a UV-laser calibration system. The experimental approach and analysis methodology are presented along with various direct applications for the upcoming next phase of the experiment at SNOLAB. These include the continuous monitoring of the detector response and electron drift properties during dark matter search runs, as well as the experimental measurement of the trigger threshold efficiency. We measure a mean ionization energy of $\mathrm{W}=27.6\pm0.2~\mathrm{eV}$ in $\mathrm{Ne + CH_4}$ $(2\%)$ for 2.8 keV X-rays, and demonstrate the feasibility of performing similar precision measurements at sub-keV energies for future gas mixtures to be used for dark matter searches at SNOLAB.
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