First Data Taken with the Level-1 Data Scouting System

The Level-1 40 MHz data scouting system will record trigger objects created by the Phase-2 Level-1 trigger at the bunch crossing rate, enabling novel analyses and improving monitoring capabilities. At the end of 2018 and from the beginning of LHC Run-3 a demonstrator system has been in operation, taking data initially from the CMS Phase-1 Global Muon Trigger and recently, from mid-2021, also from the CMS Phase-1 Calorimeter Trigger. First data obtained this novel system are shown here. Particular emphasis is placed on the utility of recording data from subsequent bunch crossings and the resulting ability to correlate arbitrary bunch crossings with each other.