The Upgrade of the ALICE Inner Tracking System
The Upgrade of the ALICE Inner Tracking System
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DOI：
10.22323/1.198.0018
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发表时间：
2014-07
期刊：
影响因子：
--
通讯作者：
M. Sitta
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文献类型：
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作者：
M. Sitta
LICE（大型离子对撞机实验）正在研究强相互作用物质的物理学，特别是夸克-胶子等离子体（QGP）的性质，使用质子-质子，质子-核和核-核碰撞在欧洲核子研究中心LHC（大型强子对撞机）。ALICE合作正在准备对实验装置进行重大升级，计划在2018-2019年第二次长时间关闭LHC时安装。ALICE升级的一个关键要素是建造一个基于单片CMOS像素探测器的新型超轻高分辨率内部跟踪系统（ITS）。ITS升级的主要重点是提高探测重味强子、热光子和QGP发射的低质量双电子的性能。相对于目前的探测器，新的内部跟踪系统将大大提高对最接近主顶点的距离的确定、低横向动量下的跟踪效率和读出速率能力。这将通过基于50 μm厚CMOS像素传感器的7个同心探测器层来实现，像素间距约为30×30 μm2。该文件于2013年9月提交给LHCC（LHC实验委员会），介绍了设计目标，总结了研发活动，重点是主要探测器组件的技术实现，以及预计的探测器和物理性能。
LICE (A Large Ion Collider Experiment) is studying the physics of strongly interacting matter, and in particular the properties of the Quark–Gluon Plasma (QGP), using proton–proton, proton–nucleus and nucleus–nucleus collisions at the CERN LHC (Large Hadron Collider). The ALICE Collaboration is preparing a major upgrade of the experimental apparatus, planned for installation in the second long LHC shutdown in the years 2018–2019. A key element of the ALICE upgrade is the construction of a new, ultra-light, high-resolution Inner Tracking System (ITS) based on monolithic CMOS pixel detectors. The primary focus of the ITS upgrade is on improving the performance for detection of heavy-flavour hadrons, and of thermal photons and low-mass di-electrons emitted by the QGP. With respect to the current detector, the new Inner Tracking System will significantly enhance the determination of the distance of closest approach to the primary vertex, the tracking efficiency at low transverse momenta, and the read-out rate capabilities. This will be obtained by seven concentric detector layers based on a 50 μm thick CMOS pixel sensor with a pixel pitch of about 30×30 μm2. This document, submitted to the LHCC (LHC experiments Committee) in September 2013, presents the design goals, a summary of the R&D activities, with focus on the technical implementation of the main detector components, and the projected detector and physics performance.