论文标题
升级内部跟踪系统和爱丽丝的时间投影室
Upgrading the Inner Tracking System and the Time Projection Chamber of ALICE
论文作者
论文摘要
在2019 - 2020年期间，在LHC的长期关闭2（LS2）期间，CERN的爱丽丝实验正在进行重大升级。有关中央桶的关键要素是安装新的内部跟踪系统（ITS）和大型投影室（TPC）的升级。 TPC目前正在使用新的读取系统进行升级，包括新的基于宝石的读数室和新的前端电子产品，使我们能够以连续模式进行操作。新的基于CMOS单片活性像素传感器将显着提高影响参数的分辨率和跟踪效率，尤其是对于横向动量低的粒子以及读取结果功能。在下文中，将概述升级及其集会和调试状态。此外，将对2025 - 2026年LHC第三次长时间关闭的升级计划进行前景。对于此升级，可以用曲面晶片尺寸的CMOS传感器制成的圆柱探测器层代替三层，以降低进一步的材料预算并改善指向分辨率。
The ALICE experiment at CERN is undergoing a major upgrade during the Long Shutdown 2 (LS2) of the LHC during 2019-2020. The key elements regarding the central barrel are the installation of a new Inner Tracking System (ITS) and the upgrade of the large Time Projection Chamber (TPC). The TPC is currently being upgraded with a new readout system, including new GEM-based Readout Chambers and new front-end electronics enabling us to operate it in continuous mode. The new ITS based on CMOS Monolithic Active Pixel Sensors will significantly improve the impact parameter resolution and the tracking efficiency, especially for particles with low transverse momenta, as well as the readout-rate capability. In the following, the upgrades and their assembly and commissioning status will be outlined. Furthermore, an outlook will be given on plans for the upgrade of the ITS foreseen for the third long shutdown of the LHC in 2025-2026. For this upgrade, the three innermost layers could be replaced by cylindrical detector layers, made of curved wafer-scale-sized CMOS sensors, to lower even further the material budget and to improve the pointing resolution.
