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arXiv 2005.12272physics.ins-detphysics.app-ph
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超相对论电子光学读出时间投影室的性能

Performance of an optically read out time projection chamber with ultra-relativistic electrons

V. C. Antochi, E. Baracchini, L. Benussi, S. Bianco, C. Capoccia, M. Caponero, G. Cavoto, A. Cortez, I. A. Costa, E. Di Marco, G. D'Imperio, G. Dho, F. Iacoange… 展开作者

V. C. Antochi, E. Baracchini, L. Benussi, S. Bianco, C. Capoccia, M. Caponero, G. Cavoto, A. Cortez, I. A. Costa, E. Di Marco, G. D'Imperio, G. Dho, F. Iacoangeli, G Maccarrone, M. Marafini, G. Mazzitelli, A. Messina, R. A. N'obrega, A. Orlandi, E. Paoletti, L. Passamonti, F. Petrucci, D. Piccolo, D. Pierluigi, D. Pinci, F. Renga, F. Rosatelli, A. Russo, G. Saviano, S Tomassini, C. Voena

摘要:

时间投影室(TPC)是精细研究气体介质中带电粒子电离的理想装置。大体积的TPC可以用合适数量的通道读出,提供超相对论带电粒子轨道的完整3D重建,即其在TPC气体体积中的能量释放序列。此外,氦基TPC是非常有希望的研究keV能量粒子作为核反冲,打开了可能性的定向搜索的暗物质(DM)和太阳中微子(SN)的研究。在本文中,我们报告了一个小TPC原型(名为LEMOn)建立的CYGNO合作,暴露于450 MeV的电子束在弗拉斯卡蒂国家实验室的束流测试设施获得的数据分析。LEMOn在大气压下使用He-CF 4混合物运行,并基于气体电子倍增器放大级,该放大级产生由亚毫米位置分辨率科学CMOS相机收集的可见光。这种类型的读出-结合快速光检测-允许电子轨道的3D重建。电子留下了一系列电离段,每个电离段对应于几keV的能量释放。他们的研究预测了核反冲的keV能量阈值和1-10 mm的纵向位置分辨率和0.1-0.3 mm的横向位置分辨率,对于光学读出TPC在DM搜索和SN测量中的应用非常有希望。

英文摘要:

The Time Projection Chamber (TPC) is an ideal candidate to finely study the charged particle ionization in a gaseous medium. Large volumes TPCs can be read out with a suitable number of channels offering a complete 3D reconstruction of an ultra-relativistic charged particle track, that is the sequence of its energy releases in the TPC gas volume. Moreover, He-based TPCs are very promising to study keV energy particles as nuclear recoils, opening the possibility for directional searches of Dark Matter (DM) and the study of Solar Neutrinos (SN). In this paper, we report the analysis of the data acquired with a small TPC prototype (named LEMOn) built by the CYGNO collaboration that was exposed to a beam of 450 MeV electrons at the Beam Test Facility of National Laboratories of Frascati. LEMOn is operated with a He-CF4 mixture at atmospheric pressure and is based on a Gas Electron Multipliers amplification stage that produces visible light collected by a sub-millimeter position resolution scientific CMOS camera. This type of readout - in conjunction with a fast light detection - allows a 3D reconstruction of the electrons' tracks. The electrons are leaving a trail of segments of ionizations corresponding to a few keV energy releases each. Their study leads to predict a keV energy threshold and 1-10 mm longitudinal and 0.1-0.3 mm transverse position resolution for nuclear recoils, very promising for the application of optically readout TPC to DM searches and SN measurements.

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