Back-end DAQ system prototype testing and integration on a full detector test system for the CMS HGCAL detector

Abstract The CMS Collaboration will replace its current endcap calorimeters with the new high granularity calorimeter (HGCAL) for operations at the HL-LHC. The HGCAL back-end DAQ (Data Acquisition) system comprises 96 FPGA-based ATCA (Advanced Telecommunications Computing Architecture) boards, each processing data from 108 input optical fibres operating at 10 Gb/s. This paper describes in detail the architecture and prototyping of the elementary unit in the back-end DAQ system of the HGCAL. We then describe and evaluate its integration and performance in a full detector test system. The resulting system provides an average data acquisition throughput at the detector's nominal rate of 750 k events per second.