The upgrade of the ALICE Inner Tracking System
The upgrade of the ALICE Inner Tracking System
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DOI：
10.1016/j.nima.2013.07.006
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发表时间：
2013-04
影响因子：
1.4
通讯作者：
S. Senyukov
中科院分区：
文献类型：
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作者：
S. Senyukov
ALICE是一个通用实验，致力于研究LHC的核-核碰撞。经过3年多的成功运行，LHC（LS 2）在2017/18年第二次长时间关闭期间的设备升级正在准备中。拟议升级的主要目标之一是扩大低横向动量稀有探测器的物理范围。罕见探针的重建需要精确确定ALICE中由内部跟踪系统（ITS）执行的主要和次要顶点。目前的ITS由6层三种技术的硅器件制成，例如，可以重建D介子，其横向动量低至102 GeV/c。进一步扩展这一范围向更低的p T需要安装新的ITS组成的7层硅探测器具有显着更好的单点分辨率和减少材料预算。预计新系统将使影响参数分辨率提高10.3倍。此外，升级后的ITS的数据速率能力应显着提高，以充分利用预期的LHC铅-铅相互作用率为50 kHz，几乎两个数量级以上，目前的读出率。本文件首先介绍了新的智能交通系统的概念设计和预期性能的要求。其次，概述了从概念到最终探测器的不同研发活动。
ALICE is a general purpose experiment dedicated to the study of nucleus–nucleus collisions at LHC. After more than 3 years of successful operation, an upgrade of the apparatus during the second long shutdown of LHC (LS2) in 2017/18 is in preparation. One of the major goals of the proposed upgrade is to extend the physics reach for rare probes at low transverse momentum. The reconstruction of the rare probes requires a precise determination of the primary and secondary vertices that is performed in ALICE by the Inner Tracking System (ITS). The present ITS made of 6 layers of three technologies of silicon devices allows, for example, to reconstruct D mesons with the transverse momentum down to∼ 2 GeV/c. Further extension of this range towards lower p T requires the installation of the new ITS consisting of 7 layers of silicon detectors with significantly better single point resolution and reduced material budget. It is expected that the new system will allow to improve the impact parameter resolution by a factor of∼ 3. Moreover, the data rate capability of the upgraded ITS should be significantly improved in order to exploit the full expected LHC lead–lead interaction rate of 50 kHz, almost two orders of magnitude above the present readout rate. The present contribution describes first the requirements for the new ITS followed by the conceptual design of the system and its expected performance. Secondly, an overview of the different R&D activities from the concept towards the final detector is given.