Abstract
The Resistive Plate Chamber (RPC) system covers the barrel region of the ATLAS muon spectrometer [1] in the pseudo-rapidity range |η|<1.05, with six independent detector layers exclusively providing the first level trigger signal and the track coordinate in the non-bending plane of the muon candidates. The system is designed to operate up to the nominal Large Hadron Collider luminosity ( ℒ = 1034 cm−2 s−1) which has been already exceeded thanks to the excellent performance of the collider. The experience in operating the present RPC system, up to the maximum instantaneous luminosity of 2.06 × 10 34 cm−2 s−1 reached in 2017, is reported. The performance of the system, in the severe background and pileup conditions of the last data taking period, is presented together with the improved tools implemented in order to have an effective monitoring of the detector status. The plans to successfully operate the present system during the HL-LHC phase are also introduced.
Highlights
Detector Status and OperationOne important feature is the full automatic control of the HV settings, which are automatically adjusted in order to follow the different LHC beam phases from injection, stable beams, to the final dump; to compensate for the local changes of the environmental conditions (mainly local temperature and atmospheric pressure); to automatically check the individual gas-gaps currents, recalibrate at each end of fill the pedestals ad to provide an online measurement of the cavern background rates and an instantaneous luminosity The Detector Control System (DCS) is in charge of safely operating and monitoring the detector power system including the detector HV and LV supply
√ In 2017 LHC provided proton-proton collisions at center of mass energy s = 13 TeV with 25 ns bunch spacing
ATLAS Resistive Plate Chamber (RPC) are monitored and operated through the Detector Control System (DCS) which is coherently integrated in the muon system so that a single shifter can operate and monitor all the muon sub-detectors
Summary
One important feature is the full automatic control of the HV settings, which are automatically adjusted in order to follow the different LHC beam phases from injection, stable beams, to the final dump; to compensate for the local changes of the environmental conditions (mainly local temperature and atmospheric pressure); to automatically check the individual gas-gaps currents, recalibrate at each end of fill the pedestals ad to provide an online measurement of the cavern background rates and an instantaneous luminosity The DCS is in charge of safely operating and monitoring the detector power system including the detector HV and LV supply. This issue is currently affecting about 6% of Figure 2: A partial crack of the gas inlet sealed by sprayed glue
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