Abstract
The Electromagnetic Calorimeter (ECAL) is one of the subdetectors of the Compact Muon Solenoid (CMS), a general-purpose particle detector at the CERN Large Hadron Collider (LHC). The CMS ECAL Detector Control System (DCS) and the CMS ECAL Safety System (ESS) have supported the detector operations and ensured the detector’s integrity since the CMS commissioning phase, more than 10 years ago. Over this long period, several changes to both systems were necessary to correct issues, extend functionality and keep them in-line with current hardware technologies and the evolution of software platforms. Due to the constraints imposed on significant changes to a running system, major hardware and software upgrades were therefore deferred to the second LHC Long Shutdown (LS2). This paper presents the architectures of the CMS ECAL control and safety systems, discusses the ongoing and planned upgrades, details implementation processes and validation methods and highlights the expectations for the post-LS2 systems.
Highlights
The Compact Muon Solenoid (CMS) Electromagnetic Calorimeter (ECAL) detector [1] is composed of a scintillating crystal calorimeter and lead/silicon preshowers
This paper focuses on the changes made in the software to integrate the new features during the Large Hadron Collider (LHC) Long Shutdown 2 (LS2)
The replacement during the LS2 of the previous ECAL Safety system (ESS) sensor readout system by industrial analogue input (AI) modules is the cornerstone of the CMS ECAL Detector Control System (DCS) upgrade plan [4]
Summary
The CMS ECAL detector [1] is composed of a scintillating crystal calorimeter and lead/silicon preshowers. The EB and EE partitions are subdivided in smaller partitions as follows: 36 super modules in the barrel and 4 Dees in the Endcaps Each of these EE/EB partitions contain a set of four paired thermistors and a water leakage sensor to provide environmental information. The ESS PLC was designed to acquire environmental information using a custom middle hardware approach (readout units) These readout units can interface the detector from the CMS experimental cavern and retransmit data to the PLC at the service cavern, protected from the experiment’s radiation field. This particular approach requires the usage of serial communication interfaces (RS485) and a custom communication protocol to operate. This paper focuses on the changes made in the software to integrate the new features during the LHC Long Shutdown 2 (LS2)
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