Electrical measurement and read-out performance of a realistic, full-scale system bench of the CMS Inner Tracker Barrel for HL-LHC

Abstract Due to the harsh environment of the High-Luminosity Phase of LHC, CMS will replace the present pixel detector with a new Inner Tracker implementing 65 nm CMOS read-out chips, CROC. The modules, i.e. the Inner Tracker subunits, are powered in series and read-out through a sophisticated opto-electrical chain. Full-scale systems are realized and tested for validation and performance assessment. The latest results obtained with a serial chain of the final prototype CROC modules for the barrel sub-detector will be presented. This system test also implements prototype mechanics and the final electrical opto-conversion stage. Results in terms of tuning, powering reliability and communication stability are presented.