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 two stage trigger. The CMS level-1 muon trigger, is custom-hardware device, processing signals from CMS muon detectors.In the presentation the evolution and the performance of the Level-1 muon trigger system is discussed.The perspectives for 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.