论文标题
BESIII圆柱形宝石检测器的宇宙数据获取的初步结果
Preliminary results from the cosmic data taking of the BESIII cylindrical GEM detectors
论文作者
论文摘要
BESIII是针对Tau-Charm Energy区域的物理优化的多功能光谱仪。检测器和加速器都正在进行升级程序，该程序将允许BESIII运行到2029年。重大升级是基于圆柱体气体电子乘数的新检测器替换内漂移室，以改善二级顶点重构和辐射耐受性。 CGEM-IT将由三个同轴层组成的圆柱三重宝石，以AR $ \，$+$ \，$ ic _4 $ _4 $ h $ _ {10} $（90:10）与场的气体混合物的田地混合在一起，并获得优化，并获得了优化的空间分辨率。新的检测器将以110美元的$ nm CMOS技术生产的创新的老虎电子产品进行读数。前端是一种自定义设计的64 $ \，$ channel ASIC，具有完全数字输出，并以无扳机模式运行。它可以提供模拟费用和时间测量，其TDC时间分辨率优于100 $ \，$ PS，该分辨率将允许以$ $ $ TPC模式运行。在贝斯伊（Besiii）内部安装之前，预计在2021年，北京高能量物理研究所正在进行长期的独立数据。当前，前两个圆柱室可用于测试，并用于完成检测器和电子设备之间的集成并评估所需的性能。在此程序中，将介绍CGEM-IT项目的描述，老虎的特征和性能以及第一个宇宙射线数据的分析结果。将重点放在带状分析上，从中可以测量检测器的基本特性和群集分析。还将提出有关效率和空间分辨率的第一个初步结果。
BESIII is a multipurpose spectrometer optimized for physics in the tau-charm energy region. Both detector and accelerator are undergoing an upgrade program, that will allow BESIII to run until 2029. A major upgrade is the replacement of the inner drift chamber with a new detector based on Cylindrical Gas Electron Multipliers to improve both the secondary vertex reconstruction and the radiation tolerance. The CGEM-IT will be composed of three coaxial layers of cylindrical triple GEMs, operating in an Ar$\,$+$\,$iC$_4$H$_{10}$ (90:10) gas mixture with field and gain optimized to maximize the spatial resolution. The new detector is readout with innovative TIGER electronics produced in 110$\,$nm CMOS technology. The front end is a custom designed 64$\,$channel ASIC featuring a fully digital output and operated in trigger-less mode. It can provide analog charge and time measurements with a TDC time resolution better than 100$\,$ps, that will allow to operate in $μ$TPC mode. Before the installation inside BESIII, foreseen in 2021, a long standalone data taking is ongoing at the Institute of High Energy Physics in Beijing; currently, the first two cylindrical chambers are available for the test, and are used to complete the integration between the detector and the electronics and to assess the required performance. In this proceeding a description of the CGEM-IT project, the TIGER features and performance, and the results of the analysis of first cosmic ray data taking will be presented. Focus will be given on the strip analysis, from which it is possible to measure the basic properties of the detector, and the cluster analysis. The first preliminary results on efficiency and spatial resolution will be also presented.
