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Upgrade of the ALICE inner tracking system: Construction and commissioning
Physica Scripta ( IF 2.9 ) Pub Date : 2020-07-16 , DOI: 10.1088/1402-4896/aba0f7
Alessandra Fantoni

ALICE (A Large Ion Collider Experiment) is the CERN LHC experiment optimized for the study of the strongly interacting matter produced in heavy-ion collisions, in particular the characterization of the quark-gluon plasma. After the successful operation of the experiment during the first two runs of the LHC, the ALICE collaboration is currently working on a major upgrade of its detectors, to be installed during the 2019–2020 Long Shutdown (LS2). The main goal is to increase the readout capabilities and allow recording of Pb–Pb minimum bias events at rates in excess of 50 kHz, which is the expected Pb–Pb interaction rate at the LHC after LS2. One key part of the upgrade is the construction of a new Inner Tracking System (called ITS2) that will significantly improve the impact parameter resolution of the tracks, tracking efficiency, and readout capacity which enables precise measurements of low momentum charged particles. The ITS2 consists of seven approximately-cylindrical detector layers of CMOS Monolithic Active Pixel Sensors (MAPS) with the sensor matrix and readout integrated on a single chip, named ALPIDE (ALice PIxel DEtector), covering an area of 10 m2 and containing about 12.5 billion pixels. All layers are mounted on ultra-lightweight carbon support structures with an embedded cooling system. This allows a reduction of the material budgets down to about 0.3% X0 for the inner layers and 1% X0 for the outer layers, with respect to the previous ITS system. After a brief overview of the upgrade motivation, details of the overall layout will be given as well as the construction and commissioning status and plans.

中文翻译:

ALICE内部跟踪系统升级:建设和调试

ALICE(大型离子对撞机实验)是 CERN LHC 实验,优化用于研究重离子碰撞中产生的强相互作用物质,特别是夸克-胶子等离子体的表征。在 LHC 前两次运行期间实验成功运行后,ALICE 合作目前正在对其探测器进行重大升级,将在 2019-2020 年长期停工 (LS2) 期间安装。主要目标是提高读出能力并允许以超过 50 kHz 的速率记录 Pb-Pb 最小偏置事件,这是 LS2 之后 LHC 的预期 Pb-Pb 相互作用速率。升级的一个关键部分是构建一个新的内部跟踪系统(称为 ITS2),它将显着提高轨道的冲击参数分辨率、跟踪效率、和读出能力,可以精确测量低动量带电粒子。ITS2 由七个近似圆柱形的 CMOS 单片有源像素传感器 (MAPS) 检测器层组成,传感器矩阵和读出器集成在单个芯片上,名为 ALPIDE(ALice 像素检测器),面积为 10 平方米,包含约 125 亿个像素。所有层都安装在带有嵌入式冷却系统的超轻型碳支撑结构上。与之前的 ITS 系统相比,这允许将材料预算减少至内层的约 0.3% X0 和外层的 1% X0。在简要概述升级动机后,将给出总体布局的详细信息以及建设和调试状态和计划。
更新日期:2020-07-16
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