A cosmic ray readout system for qualifications of small-strip thin gap chambers of the ATLAS muon spectrometer Phase-I upgrade

Xu Wang, K. Hu, Houbing Lu, Feng Li, Hang Yang, Xinxin Wang, Tianru Geng, L. Han, G. Jin
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Abstract

The Atlas detector, which is one of the Large Hadron Collider (LHC) at CERN, will be upgraded in order to extend the frontiers of particle physics. Bunches of up to 1011 protons will collide at the rate of 40MHz to provide 14TeV proton-proton collisions at a designed luminosity of 1034cm-2s-1. Currently ATLAS is under Phase-I upgrade, which focus mainly on the Level-1 trigger system to maintain the full acceptance of muon tracking while discriminate against background and keep the Level-1 rate at an acceptable level. The New Small Wheel(NSW), which consists of 16 detector planes in two multi-layers comprising of four small-strip Thin Gap Chamber(sTGC) and four MicroMagas(MM) detector planes, is to replace the current muon Small Wheel in order to achieve the upgrade goals. The sTGC Level-1 pad trigger logic is implemented first single wedge pad trigger which is based on coincident hits in three out of four layers of a multiplet in each wedge independently and then pad trigger which is based on geometrical matching between the two wedge triggers in order to identify the interaction point (IP). We designed the pads Front End Board (pFEB) to gather and analyses pads trigger which is the most important issue for Atlas Phase-I upgrade.
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用于ATLAS μ介子光谱仪一期升级小条形薄间隙室检定的宇宙射线读出系统
欧洲核子研究中心(CERN)大型强子对撞机(LHC)中的阿特拉斯(Atlas)探测器将进行升级,以拓展粒子物理学的前沿。多达1011个质子将以40MHz的速度碰撞,在1034cm-2s-1的设计亮度下提供14TeV的质子-质子碰撞。目前ATLAS正处于第一阶段的升级阶段,升级的重点是1级触发系统,以保持对μ子跟踪的完全接受,同时区分背景,使1级率保持在可接受的水平。新型小轮(New Small Wheel, NSW)由4个小带薄间隙腔(Small -strip Thin Gap Chamber, sTGC)和4个MicroMagas(MM)探测器组成的2个多层16个探测器平面组成,旨在取代现有的μ子小轮,实现升级目标。sTGC -1级垫触发逻辑首先实现单楔垫触发,该触发基于每个楔中四层中的三层的重合命中,然后基于两个楔之间的几何匹配来确定交互点(IP)。我们设计了pad前端板(pFEB)来收集和分析pad触发,这是Atlas第一期升级中最重要的问题。
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