Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 90: DAQ / Trigger II

T 90.10: Talk

Thursday, March 22, 2018, 18:45–19:00, Z6 - SR 2.010

Improved timing of the ATLAS Level-1 Calorimeter Trigger to 1 ns precision — •Fabrizio Napolitano and Oleg Brandt — Kirchhoff-Institut für Physik, U. Heidelberg

The Level-1 Calorimeter Trigger (L1Calo) is an important part of the ATLAS Level-1 Trigger system, designed to identify electrons, jets, photons and hadronic tau candidates, as well to measure their transverse energies, total transverse energy and missing transverse energy. The correct timing of the 7168 trigger towers ensures an optimal performance of the L1Calo system. The timing information can be extracted by analysing the shapes of the L1Calo signals. Using beam splash and proton-proton collision data recorded in 2017, a timing precision of 1 ns is achieved. A similar performance is attained for the on-board timing scans, which serve to monitor the stability of the timing over time.