Performance of optically readout GEM-based TPC with a 55Fe source
Performance of optically readout GEM-based TPC with a 55Fe source
复制标题
使用 55Fe 源的基于 GEM 的光学读出 TPC 的性能
DOI：
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发表时间：
2019
影响因子：
1.3
通讯作者：
S. Tomassini
中科院分区：
文献类型：
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作者：
I. A. Costa;E. Baracchini;F. Bellini;L. Benussi;S. Bianco;M. Caponero;G. Cavoto;G. D’Imperio;E. Marco;G. Maccarrone;M. Marafini;G. Mazzitelli;A. Messina;F. Petrucci;D. Piccolo;D. Pinci;F. Renga;F. Rosatelli;G. Saviano;S. Tomassini
具有多个气体电子倍增器(GEMS)放大级的大型时间投影室(TPC)的光学读出已被证明为高能粒子跟踪提供了非常有趣的性能。低能量和稀有事件研究的拟议应用，如暗物质搜索，要求在kev能量范围内具有苛刻的性能。作为天鹅座项目研发的一部分，在7升灵敏体积探测器内使用55Fe源，详细研究了这种读数的性能随电场配置和宝石增益的函数。本文报告的结果表明，该传感器的低噪声水平允许在2keV阈值下工作，同时使每年的假事件率保持在10以下。在这种配置下，对于5.9keV的光子，探测效率远高于95%，能量分辨率(σ)为18%，显示了这种技术非常有前途的能力。
Optical readout of large Time Projection Chambers (TPCs) with multiple Gas Electron Multipliers (GEMs) amplification stages has shown to provide very interesting performances for high energy particle tracking. Proposed applications for low-energy and rare event studies, such as Dark Matter search, ask for demanding performance in the keV energy range. The performance of such a readout was studied in details as a function of the electric field configuration and GEM gain by using a 55Fe source within a 7 litre sensitive volume detector developed as a part of the R&D for the CYGNUS project. Results reported in this paper show that the low noise level of the sensor allows to operate with a 2 keV threshold while keeping a rate of fake-events lesser than 10 per year. In this configuration, a detection efficiency well above 95% along with an energy resolution (σ) of 18% is obtained for the 5.9 keV photons demonstrating the very promising capabilities of this technique.