Study of the trigger system performance of the ICARUS T600 detector at Fermilab exposed to the Booster and NuMI neutrino beams

The ICARUS T600 LAr-TPC detector started taking data at Fermilab exposed to the Booster Neutrino Beam (BNB) and to the NuMi off-axis beam within the Short Baseline Neutrino (SBN) program, to definitively clarify the open questions of the presently-observed neutrino anomalies, related to the possible existence of sterile neutrinos. The ICARUS trigger system exploits 360 PMTs installed behind the TPC wire planes to recognize with a programmable logic the beam-related neutrino events inside the 1.6 and 9.5 microseconds spills of BNB and NuMI and, in perspective, the in-time signals by the external Cosmic Ray Tagging system surrounding the detector. Special ad hoc circuits exploiting the sum of 15 PMT signals have been prepared and installed in the trigger system to improve its performance. The activity consisted of the study of the performance of the trigger system, in terms of efficiency and spatial recognition capabilities of the collected neutrino events for different settings of the logic introduced in dedicated trigger FPGAs. For these purposes, the visual study of the collected events will be also supported by the analysis of Monte Carlo events. Furthermore, the use of the new circuits exploiting the analog sum of 15 PMT signals will be carefully studied aiming to their activation in the system.