Quality Certification 4 (QC4) for RE4 in the Upgrade in CMS

S Carpinteyro Bernardino

doi:10.1088/1742-6596/651/1/012005

Abstract

The CMS muon system consist of Drif Tubes (DTs) in barrel region, Cathode Strip Chambers (CSCs) in the end-cap region and Resistive Plate Chambers (RPCs) in both regions. The RPCs with their excellent time resolution were chosen as dedicated muon trigger detector for the CMS experiment. After the Long Shutdown 1 (LS1) the LHC luminosity should reach 1034cm-2s-1 thus it is necessary to improve the level 1 trigger efficiency of the CMS detector for this high luminosity, to achieve that a 4th RPCs layer (RE4) in both end-caps of the CMS detector and all the components must be installed and completely validated. Based on the valuable experience (Barrel & Endcap) are defined several steps of Quality Certification (QC): QC1 (Components), QC2 (Gaps), QC3 (Chambers), QC4 (chambers & Super Modules), QC5 (Commissioning at P5). In this work is presented some results of QC4.

Highlights

After the Long Shutdown 1 (LSD1) the Large Hadron Collider (LHC) luminosity should reach 1034cm−2s−1 [1]
The Resistive Plate Chambers (RPCs) are widely employed for the muon trigger systems thanks to their fast time resolution (∼1ns), suitable space resolution (∼1cm) besides its low production cost
The fourth end-cap layer is being installed during the long shutdown (2013-2014), LHC will operate with its full designed luminosity

Summary

Introduction

After the Long Shutdown 1 (LSD1) the LHC luminosity should reach 1034cm−2s−1 [1]. during the LSD1 the Compact Muon Solenoid (CMS) collaboration is upgrading several subsystems in the detector. The instrumentation of the muon system, will be extendeded in both end-caps to ensure efficient muon triggering and reconstruction in that region at high luminosities. The RPCs are widely employed for the muon trigger systems thanks to their fast time resolution (∼1ns), suitable space resolution (∼1cm) besides its low production cost.

Results

Conclusion