ArDM: a ton-scale LAr detector for direct Dark Matter searches
ArDM Collaboration, A. Marchionni, C. Amsler, A. Badertscher, V. Boccone, A. Bueno, M. C. Carmona-Benitez, J. Coleman, W. Creus, A. Curioni, M. Daniel, E. J. Da… 展开作者
ArDM Collaboration, A. Marchionni, C. Amsler, A. Badertscher, V. Boccone, A. Bueno, M. C. Carmona-Benitez, J. Coleman, W. Creus, A. Curioni, M. Daniel, E. J. Dawe, U. Degunda, A. Gendotti, L. Epprecht, S. Horikawa, L. Kaufmann, L. Knecht, M. Laffranchi, C. Lazzaro, P. K. Lightfoot, D. Lussi, J. Lozano, K. Mavrokoridis, A. Melgarejo, P. Mijakowski, G. Natterer, S. Navas-Concha, P. Otyugova, M. de Prado, P. Przewlocki, C. Regenfus, F. Resnati, M. Robinson, J. Rochet, L. Romero, E. Rondio, A. Rubbia, L. Scotto-Lavina, N. J. C. Spooner, T. Strauss, C. Touramanis, J. Ulbricht, T. Viant
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To appear in Proceedings 1st International Workshop towards the Giant Liquid Argon Charge Imaging Experiment (GLA2010), Tsukuba, March 2010
The Argon Dark Matter (ArDM-1t) experiment is a ton-scale liquid argon (LAr) double-phase time projection chamber designed for direct Dark Matter searches. Such a device allows to explore the low energy frontier in LAr with a charge imaging detector. The ionization charge is extracted from the liquid into the gas phase and there amplified by the use of a Large Electron Multiplier in order to reduce the detection threshold. Direct detection of the ionization charge with fine spatial granularity, combined with a measurement of the amplitude and time evolution of the associated primary scintillation light, provide powerful tools for the identification of WIMP interactions against the background due to electrons, photons and possibly neutrons if scattering more than once. A one ton LAr detector is presently installed on surface at CERN to fully test all functionalities and it will be soon moved to an underground location. We will emphasize here the lessons learned from such a device for the design of a large LAr TPC for neutrino oscillation, proton decay and astrophysical neutrinos searches.
Performance of a SensL-30035-16P Silicon Photomultiplier array at liquid argon temperature
下一代多吨级的稀有液体实验有独特的机会发现TeV级的暗物质粒子，在WIMP核子散射截面中达到10^-48 cm 2的灵敏度。一个先决条件是将放射性本底源减少到可以忽略不计的水平。这只有在超纯高效光电传感器可用于闪烁光读出时才有可能。目前的实验（如氙，LUX，黑暗，ArDM）使用低温光电倍增管作为光电传感器。硅光电倍增器阵列（SiPM阵列）是一种有吸引力的替代方案，它在单光子探测方面表现出无与伦比的性能。本文报道了SensL-30035- 16 P SiPM阵列和定制的低温前端板在液氩温度下的性能。
Scintillation light production, propagation, and detection in the 4-ton dual-phase LAr-TPC demonstrator (data analysis and simulations)
深层地下中微子实验（DUNE）远探测器（FD）将由四个10千吨液态氩（LAr）时间投影室（TPC）组成，使用单相和双相技术。双相技术预见到在信号收集之前在气相中的电荷放大，并且遵循分阶段的方法来证明其在DUNE FD规模上的可行性。2017年，一个3 x 1 x 1 m $^3$体积的4吨演示器暴露于宇宙μ子，并在电荷提取和光收集方面展示了预期的性能。一个更大的原型（ProtoDUNE-DP），有效体积为6x6 x6米$^3$，目前正在欧洲核子研究中心调试。在这些探测器中的光子探测系统是至关重要的，以提供触发信号，给出一个绝对的时间参考的电荷采集系统的罕见的非束事件，并提供补充量热法。概述了对4吨演示器中收集的光的分析。这些原型证实了光检测系统的性能，以基于闪烁光信号提供触发，表征LAr对交叉μ子的响应并监测LAr纯度。分析的数据进行了比较与MC模拟，以改善了解较少的LAr光学参数，如瑞利散射长度的值。
