Speaker
Description
The Time-of-Flight (ToF) detectors in the ATLAS Forward Proton (AFP) system are used to measure the primary vertex z-position of the pp -> pXp processes using the arrival times of the two intact final state protons. During LHC Long Shutdown 2, the ToF detector underwent major upgrades in electronics, optics, and mechanics, expected to provide a substantial improvement in detection efficiency. Detection efficiencies and timing resolutions using low, moderate and high pile-up data collected during LHC Run 3 are presented. The efficiency dependence on the event rate will be shown. The resolutions of the two ToF detectors of around 30 ps were measured, which corresponds to the expected precision of 9.0 ± 0.1 mm for the vertex reconstruction. Finally, the improvements to restore efficiencies at high rates will be discussed.
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