Test beam demonstration of silicon microstrip modules with transverse momentum discrimination for the future CMS tracking detector
Test beam demonstration of silicon microstrip modules with transverse momentum discrimination for the future CMS tracking detector
复制标题
DOI：
10.1088/1748-0221/13/03/p03003
复制
发表时间：
2018-03
影响因子：
1.3
通讯作者：
W. Adam;T. Bergauer;E. Brondolin;M. Dragicevic;M. Friedl;R. Frühwirth;M. Hoch;J. Hrubec;A. K
中科院分区：
文献类型：
--
作者：
W. Adam;T. Bergauer;E. Brondolin;M. Dragicevic;M. Friedl;R. Frühwirth;M. Hoch;J. Hrubec;A. K
一个新的CMS跟踪器正在开发中，从2026年起在高亮度LHC上运行。它包括一个基于专用模块的外部跟踪器，该模块将使用两个紧密间隔的硅传感器层中的空间重合簇来重建短轨道段（称为存根）。这些模块允许拒绝低横向动量轨道命中，并减少传输到第一级触发之前的数据量。在触发器决策中包含跟踪信息对于限制第一级触发器接受率至关重要。一个定制的前端读出芯片，CMS二进制芯片（CBC），包含存根查找逻辑已被设计用于此目的。一个原型模块，配备了CBC芯片，已建成和运行的第一次在4 GeV/c正电子束在DESY。短截线发现的行为进行了研究，为不同角度的光束入射到一个模块上，这使得未来的CMS检测器内的横向动量的灵敏度的估计。一个尖锐的横向动量阈值约为2 GeV/c，这符合要求，拒绝大部分的低动量轨道存在于LHC环境中的检测器。这是硅跟踪模块的第一次真实演示，该模块能够根据粒子的横向动量选择数据，用于LHC的第一级触发。本测试的结果如下所述。
A new CMS Tracker is under development for operation at the High Luminosity LHC from 2026 onwards. It includes an outer tracker based on dedicated modules that will reconstruct short track segments, called stubs, using spatially coincident clusters in two closely spaced silicon sensor layers. These modules allow the rejection of low transverse momentum track hits and reduce the data volume before transmission to the first level trigger. The inclusion of tracking information in the trigger decision is essential to limit the first level trigger accept rate. A customized front-end readout chip, the CMS Binary Chip (CBC), containing stub finding logic has been designed for this purpose. A prototype module, equipped with the CBC chip, has been constructed and operated for the first time in a 4 GeV/c positron beam at DESY. The behaviour of the stub finding was studied for different angles of beam incidence on a module, which allows an estimate of the sensitivity to transverse momentum within the future CMS detector. A sharp transverse momentum threshold around 2 GeV/c was demonstrated, which meets the requirement to reject a large fraction of low momentum tracks present in the LHC environment on-detector. This is the first realistic demonstration of a silicon tracking module that is able to select data, based on the particle's transverse momentum, for use in a first level trigger at the LHC . The results from this test are described here.