The trigger chambers of the ATLAS muon spectrometer: production and tests (original) (raw)
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Abstract The Atlas Trigger System has been designed to reduce the LHC interaction rate of about 1 GHz to the foreseen storage rate of about 100 Hz. Three trigger levels are applied in order to fulfill such a requirement. A detailed simulation of the ATLAS experiment including the hardware components and the logic of the Level-1 Muon trigger in the barrel of the muon spectrometer has been performed. This simulation has been used not only to evaluate the performances of the system but also to optimize the trigger logic design.
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The high luminosity upgrade to the Large Hadron Collider (LHC), means a significant increase in data, which the existing muon trigger system’s bandwidth is inadequate to process. The solution for enabling the muon system to handle this increase in data is the installation of thin Gas Electron Multiplier (GEM) detectors in front of the existing Cathode Strip Chambers (CSC), where the magnetic field is strong allowing for best measurement of the transverse momentum (p$_{\text{T}}$). By combining the data from the new GE1/1 system with the ME1/1, we can increase the p$_{\text{T}}$ resolution of the Level one (L1) trigger, allowing us to filter out many soft muons which otherwise would have been incorrectly reconstructed by the ME1/1 system alone, thus reducing the load on the higher level triggering system to catch these poor quality muons. In order to successfully implement this combined triggering system in time for the scheduled run-3, there must be an efficient means of commission ...
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