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

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.