The upgrade and re-validation of the Compact Muon Solenoid Electromagnetic Calorimeter Control System

O Holme,L Djambazov,G Dissertori,W Lustermann,D Jovanovic,D Di Calafiori,S Zelepoukine,P Adzic

doi:10.1088/1742-6596/513/1/012013

Abstract

The Electromagnetic Calorimeter (ECAL) is one of the sub-detectors of the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC) at CERN. The Detector Control System (DCS) that has been developed and implemented for the CMS ECAL was deployed in accordance with the LHC schedule and has been supporting the CMS data-taking since LHC physics runs started in 2009. During these years, the control system has been regularly adapted according to operational experience and new requirements, always respecting the constraints imposed on significant changes to a running system. Several hardware and software upgrades and system extensions were therefore deferred to the first LHC Long Shutdown (LS1). This paper presents the main architectural differences between the system that supported the CMS ECAL during its first years and the new design for the coming physics runs after LS1. Details on the upgrade planning, including the certification methods performed in the CMS ECAL DCS laboratory facilities, reports on the implementation progress and the expectations for the post-LS1 system are highlighted.

Highlights

The Electromagnetic Calorimeter (ECAL) of Compact Muon Solenoid (CMS) detects and measures the particles released from high energy collisions in the Large Hadron Collider (LHC) with 75,848 lead tungstate scintillator crystals and over 4,000 silicon sensors
The hardware and software layers of the CMS ECAL Detector Control System (DCS) are implemented using industrial technologies as well as those resulting from CERN collaborations
It is essential to replace ageing hardware, resolve issues discovered in the previous years and to make use of new technologies to ensure that the DCS continues to perform optimally and can provide the required standards of functionality and robustness for the phase of LHC physics

Summary

Introduction

The ECAL of CMS detects and measures the particles released from high energy collisions in the LHC with 75,848 lead tungstate scintillator crystals and over 4,000 silicon sensors. The CMS ECAL DCS controls and monitors the power supplies and provides monitoring of the environmental conditions within the detector volume to ensure that it is running within acceptable parameters [1]. The hardware and software layers of the CMS ECAL DCS are implemented using industrial technologies as well as those resulting from CERN collaborations. To reflect the structure of the detector, the CMS ECAL DCS divides the detector into three logical partitions, the barrel (EB), the endcaps (EE) and the preshower (ES). It is essential to replace ageing hardware, resolve issues discovered in the previous years and to make use of new technologies to ensure that the DCS continues to perform optimally and can provide the required standards of functionality and robustness for the phase of LHC physics

Hardware evolution

Conclusion