论文标题
CGEM内部跟踪器的操作和读数
Operation and readout of the CGEM Inner Tracker
论文作者
论文摘要
最近批准的BESIII实验（IHEP，北京）的十年延长促进了加速器和检测器的升级计划。特别是，目前的内部漂移室正衰老，该提议是基于圆柱形宝石技术将其替换为检测器。 CGEM内部跟踪器（CGEM-IT）由三个同轴层组成。预计该跟踪器将恢复效率，提高Z性和二级顶点位置重建，在XY平面中的空间分辨率为130μm，并且沿束方向沿XY平面130μm，并且优于300μm。开发了专用的读数系统。探测器条的信号由Tiger处理，Tiger是一种自定义的64通道ASIC，可通过大约50 fc（小于3 ns抖动）的全数字输出提供模拟费用读数。老虎将以无触发模式的超阈值数据流到基于FPGA的读数模块（称为GEM读取卡）中，该模块在扳机到达时通过构建事件数据包来组织传入的数据。自2020年1月以来，北京正在运营三层中的两层中的两层。由于大流行状况，整合活性在小规模的原型上持续了。最近，通过最终电子配置在CERN上进行了测试光束。在本演讲中，将介绍CGEM-IT项目的一般状态，特别关注测试光束数据采集的结果。
A recently approved ten-year extension of the BESIII experiment (IHEP, Beijing) motivated an upgrade program for both the accelerator and the detector. In particular, the current inner drift chamber is suffering from aging and the proposal is to replace it with a detector based on the cylindrical GEM technology. The CGEM inner tracker (CGEM-IT) consists of three coaxial layers of triple GEM. The tracker is expected to restore efficiency, improve z-determination and secondary vertex position reconstruction with a spatial resolution of 130 μ m in the xy-plane and better than 300 μ m along the beam direction. A dedicated readout system was developed. Signals from the detector strips are processed by TIGER, a custom 64-channel ASIC that provides an analog charge readout via a fully digital output up to about 50 fC, less than 3 ns jitter. TIGER continuously streams over-threshold data in trigger-less mode to an FPGA-based readout module, called GEM Read Out Card, that organizes the incoming data by building the event packets when the trigger arrives. Two of the three layers are in operation in Beijing since January 2020 remotely controlled. Due to the pandemic situation the integration activity has been continued on a small-scale prototype. Recently, a test beam has been performed at CERN with the final electronics configuration. In this presentation, the general status of the CGEM-IT project will be presented with a particular focus on the results from the test beam data acquisition.
