标题： BESIII实验在高能物理研究所的圆柱形GEM内轨迹探测器 显示英文标题

标题： A Cylindrical GEM Inner Tracker for the BESIII experiment at IHEP

摘要： 北京电子谱仪III（BESIII）是一种多用途探测器，它收集由北京正负电子对撞机II（BEPCII）提供的碰撞数据，该对撞机位于北京高能物理研究所。 自开始运行以来，BESIII已经收集了世界上最大的J/{\psi }和{\psi }(2s) 样本。 由于亮度增加到其标称值10^33 cm-2 s-1以及老化效应，MDC在第一层的效率相对于2014年的值下降了高达35%。 由于BESIII需要在2022年之前继续采集数据，并有可能延续到2027年，意大利合作组提议用三层独立的圆柱形三气体电子倍增器（CGEM）替换MDC的内部部分。 CGEM-IT项目将部署一些新的功能和创新，与其他当前基于GEM的探测器不同：{\mu }TPC和模拟读出，结合时间和电荷测量，将使在1 T磁场中达到130{\mu }m的空间分辨率成为可能，这正是BESIII合作组所要求的。 在本次会议中，将介绍该项目的最新进展，特别关注平面和圆柱形原型在测试束数据中的结果。 这些结果超越了磁场所需的GEM技术现状。 显示英文摘要

摘要： The Beijing Electron Spectrometer III (BESIII) is a multipurpose detector that collects data provided by the collision in the Beijing Electron Positron Collider II (BEPCII), hosted at the Institute of High Energy Physics of Beijing. Since the beginning of its operation, BESIII has collected the world largest sample of J/{\psi} and {\psi}(2s). Due to the increase of the luminosity up to its nominal value of 10^33 cm-2 s-1 and aging effect, the MDC decreases its efficiency in the first layers up to 35% with respect to the value in 2014. Since BESIII has to take data up to 2022 with the chance to continue up to 2027, the Italian collaboration proposed to replace the inner part of the MDC with three independent layers of Cylindrical triple-GEM (CGEM). The CGEM-IT project will deploy several new features and innovation with respect the other current GEM based detector: the {\mu}TPC and analog readout, with time and charge measurements will allow to reach the 130 {\mu}m spatial resolution in 1 T magnetic field requested by the BESIII collaboration. In this proceeding, an update of the status of the project will be presented, with a particular focus on the results with planar and cylindrical prototypes with test beams data. These results are beyond the state of the art for GEM technology in magnetic field.