arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.16194physics.ins-det
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密封式液体氙时间投影室的研制与性能

Development and Performance of a Sealed Liquid Xenon Time Projection Chamber

Yuehuan Wei, Jianyu Long, Francesco Lombardi, Zhiheng Jiang, Jingqiang Ye, Kaixuan Ni

摘要:

液态氙(LXe)时间投影室(TPC)技术正在探测从亚GeV到几TeV的大范围暗物质质量。为了进一步提高其对亚GeV暗物质的灵敏度,并利用相干弹性中微子-核散射(CEvNS)监测反应堆中微子,需要对单电子/少电子本底率有更多的了解和抑制。在这里,我们报告的设计和性能的密封LXeTPC与石墨烯涂层的熔融石英窗口作为阴极。密封TPC的目的是将液体氙目标体积与检测器容器中的大部分释气材料隔离,从而提高液体氙净化效率并降低杂质诱导的单个/少数电子背景。我们研究了出气率和净化效率使用的数据从密封TPC与一个简单的净化模型。获得了稀土中杂质光电离的单电子信号,并研究了它们与稀土纯度的关系。将石墨烯涂覆的电极上的光电子发射速率与不锈钢的光电子发射速率进行比较,不锈钢是通常用于LPEG 4检测器的电极材料。我们讨论了可能的进一步改进和潜在的应用密封TPC的下一代液体氙实验的暗物质和中微子物理。

英文摘要:

The liquid xenon (LXe) time projection chamber (TPC) technology is probing a wide range of dark matter masses from sub-GeV to a few TeV. To further improve its sensitivity to sub-GeV dark matter and its application in reactor neutrino monitoring via coherent elastic neutrino-nucleus scattering (CEvNS), more understanding and suppression of single/few electrons background rate are needed. Here we report on the design and performance of a sealed LXeTPC with a graphene-coated fused silica window as the cathode. The purpose of the sealed TPC is for isolating the liquid xenon target volume from the majority of out-gassing materials in the detector vessel, thus improving the liquid xenon purification efficiency and reducing the impurity-induced single/few electrons background. We investigated the out-gassing rate and purification efficiency using the data from the sealed TPC with a simple purification model. The single electron signals from the photoionization of impurities in LXe are obtained and their correlation with the LXe purity is investigated. The photo-electron emission rate on the graphene-coated electrode is compared to that from stainless steel, the electrode material typically used in LXe detectors. We discuss the possible further improvement and potential applications of the sealed TPC for the next generation liquid xenon experiments for dark matter and neutrino physics.

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