Abstract
ABSTRACT ATLAS is one of the four experiments at the LHC pp collider at CERN, Geneva. The experiment, designed to investigate wide range of physics processes, requires precise measurement RIDFFHOHUDWRU¶VOXPLQRVLW\WRpredict rates of processes with small cross sections (e.g. production of Higgs boson). The ALFA detectors (Absolute Luminosity For ATLAS), located on av. 240 m on both sides from the ATLAS Interaction Point (IP), provide independent luminosity measurement by counting protons elastically scattered at small angles. The measurement can be performed only at low luminosity and special LHC optics KLJK which allow close approaching the LHC beams by the ALFA detectors. Duration of such settings is limited and requires that the calibration of detectors have to run in parallel with the measurement. Distant location from the ATLAS IP creates challenges with integration and synchronization of ALFA local timing and triggering with the ATLAS Trigger and Data Acquisition System (TDAQ). This paper briefly reviews construction of the ALFA detectors, organization of the front-end electronics and concentrates on hardware integration with the ATLAS trigger system Keywords: ATLAS experiment, ALFA detector, Roman pots, trigger, latency
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