CERN Accelerating science

CMS Note
Report number	CMS-CR-2024-010
Title	CMS Level-1 Trigger Upgrade
Author(s)	Palencia Cortezon, Jose Enrique (Oviedo U.)
Publication	2024
Collaboration	CMS Collaboration
Imprint	07 Jan 2024
Number of pages	6
Published in:	PoS LHCP2023 (2024) 113
Presented at	11th Large Hadron Collider Physics Conference 2023, Belgrade, Serbia, 22 - 26 May 2023, pp.113
DOI	10.22323/1.450.0113
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; CMS
Keywords	Trigger
Abstract	To achieve the physics goals of the High Luminosity LHC program, the CMS Phase-2 upgrade of the Level-1 trigger system utilizes modern technologies to enhance the physics selectivity already at the hardware level of the data acquisition system. The intense hadronic environment corresponding to 200 simultaneous collisions per bunch crossing, imposes serious challenges to the system requirements. To profit from the extended coverage and increased granularity of the upgraded CMS detector, the latency of the system is extended to 12.5 $\mu$s. The use of tracking and high-granularity calorimeter information becomes possible for the first time at Level-1. The maximum output bandwidth is 750 kHz. Modern processors are used to implement sophisticated algorithms including machine learning-based approaches to target the selection of specific final states.
Other source	Inspire