Status and Future of the CMS Tracker DCS

Wassef Karimeh,Andromachi Tsirou,Maroun Chammoun,Piero Giorgio Verdini,Ivan Shvetsov,C Doglioni,W Kamleh,G.A Stewart,L Silvestris,P Jackson,D Kim

doi:10.1051/epjconf/202024501005

Abstract

Detector Control Systems (DCS) for modern High-Energy Physics (HEP) experiments are based on complex distributed (and often redundant) hardware and software implementing real-time operational procedures meant to ensure that the detector is always in a safe state, thus maximizing the lifetime of the detector. Display, archival and often analysis of the environmental data are also part of the tasks assigned to DCS systems. The CMS Tracker Control System (TCS) is a resilient system that has been designed to safely operate the silicon tracking detector in the CMS experiment. It has been built on top of an industrial Supervisory Control and Data Acquisition (SCADA) software product WinCC OA extended with a framework developed at CERN, JCOP, along with CMS and Tracker specific components. The TCS is at present undergoing major architecture redesign which is critical to ensure efficient control of the detector and its future upgrades for the next fifteen years period. In this paper, we will present an overview of the Tracker DCS and the architecture of the software components as well as the associated deliverables.

Highlights

Introduction The Supervisory Control and Data Acquisition (SCADA) system used inCMS and all other Large Hadron Collider (LHC) detectors as well as the accelerator has been chosen long before their commissioning
2.1 Introduction The SCADA system used in CMS and all other LHC detectors as well as the accelerator has been chosen long before their commissioning
The choice has been made after an extensive market survey and PVSS (ETM, Austria) was the only market product capable of fulfilling most of the requirements for a CERN-wise SCADA system

Summary

The TCS Architecture

The CMS is a Large Hadron Collider (LHC) detector that consists of several subdetectors that fill the detector volume in compact cylindrical layers. This comes at a cost: the Tracker detector has many millions of readout channels and dissipates more than 100 kW It must be actively cooled and its operating temperature is below the dewpoint of the cavern, so it is installed in a humidity controlled atmosphere and flushed with dry air to avoid condensation and ice formation. Information from power supplies, Tracker Safety System (TSS) and Detector Control Units (DCUs) [4], transmitted from the experiment Data Acquisition (DAQ) over SOAP (Simple Object Access Protocol) [5], are constantly flushed and evaluated by the TCS. The environmental sensors needed to ensure a safe operating environment for the Tracker are directly connected to a set of PLC systems which form the core of the autonomous hardware TSS and manage the interlock system for the Tracker power supplies (should the TCS not have already intervened). In addition to interlock actions available to the TSS, detailed analyses are run continuously within the TCS and the resulting plots are examined and validated by human operators at least once daily

Tracker Control Software

Conclusions And Future