The RPC LVL muon trigger…RPCμ子触发LVL1….pptVIP

ATLAS experiment @ LHC The ATLAS Muon Spectrometer RPC positions and structure are derived from an ASCII database (AMDB) which includes also detailed informations on inactive volumes (PET spacers, border) Level-1 simulation: Trigger performances Level-1 simulation: Trigger rates The ATLAS Barrel Level-1 muon trigger is a big and complex system: Extremely high initial interactions rate (1 GHz) Large RPCs system (~1000 Units, 3650 m2) Trigger electronics reduces informations from 350k readout channels to 400 32-bit words Flexible pT selection system (Low/High pT ) Events rejection factor 104 Big efforts from both hardware and software community: Production, QC and Tests of the RPCs Developments of very detailed simulation code Simulation results confirm the design performances of the Level-1 RPC system Selection efficiency for all the High/Low pT thresholds and trigger rates * The ATLAS RPC Level-1 Muon Trigger: Design and Simulation Francesco Conventi University of Naples and INFN Naples on behalf of Naples and ROMA1 Level-1 Trigger group VIIth Workshop on Resistive Plate Chambers and Related Detectors Overview LHC and ATLAS detector Level-1 Muon Trigger Level-1 Simulation Detector description Coincidence Windows Physics performances Trigger chambers: RPC Level -1 RPC Trigger Logic and segmentation LHC machine and ATLAS detector Physics @ LHC Muon Spectrometer Trigger/DAQ in ATLAS ~1011 protons/bunch 40 MHz (tbc=25 ns) bunch crossing rate 1034 cm-2s-1 Luminosity 14 TeV Energy 4.2 km ~27 km LHC Radius Circumference ATLAS detector Inner Detector Hadronic calorimeter EM calorimeter Muon Spectrometer The ATLAS physics program The high energy and luminosity of the LHC offers a large range of physics opportunities: Higgs boson searches (113.5 GeV/c mH 1 TeV/c) SUSY Precision measurements (W and t quark) B physics SM Higgs branching fractions For mH 130 GeV/c the best experimental signature come from the H ? 4 μ decay mode Acceptance :