Seminarium Fizyki Wielkich Energii

The event selection in the CMS experiment is necessary to reduce the LHC event rate down to O(1kHz) suitable for event storage.This selection is done by the CMS trigger, which is divided into Level-1 and High-Level Trigger layers.The CMS level-1 muon trigger is custom-hardware device, processing signals from CMS muon detectors.In the presentation the evolution of the Level-1 muon trigger system is discussed.The performance of the trigger in LHC Run-1 and Run-2 is summarized.The perspectives for operation in Run-3 and upgrade for LHC Phase-II are given.The activities of Warsaw Group, responsible for the trigger operation in a barrel-endcap overlap of the CMS detector, are emphasized.