The trigger and data acquisition system of the FASER experiment
Creators: name: Abreu, Henso
name: Mansour, Elham Amin
name: Antel, Claire
name: Ariga, Akitaka
name: Ariga, Tomoko
name: Bernlochner, Florian
name: Boeckh, Tobias
name: Boyd, Jamie
name: Brenner, Lydia
name: Cadoux, Franck
name: Casper, David
name: Cavanagh, Charlotte
name: Chen, Xin
name: Coccaro, Andrea
name: Debieux, Stephane
name: Dmitrievsky, Sergey
name: D'Onofrio, Monica
name: Dozen, Candan
name: Favre, Yannick
name: Fellers, Deion
name: Feng, Jonathan L.
name: Ferrere, Didier
name: Gamberini, Enrico
name: Galantay, Edward Karl
name: Gibson, Stephen
name: Gonzalez-Sevilla, Sergio
name: Gornushkin, Yuri
name: Gwilliam, Carl
name: Hsu, Shih-Chieh
name: Hu, Zhen
name: Iacobucci, Giuseppe
name: Inada, Tomohiro
name: Jakobsen, Sune
name: Johnson, Eliott
name: Kajomovitz, Enrique
name: Kling, Felix
name: Kose, Umut
name: Kuehn, Susanne
name: Lefebvre, Helena
name: Levinson, Lorne
name: Li, Ke
name: Liu, Jinfeng
name: Magliocca, Chiara
name: McFayden, Josh
name: Milanesio, Matteo
name: Meehan, Sam
name: Mladenov, Dimitar
name: Moretti, Theo
name: Munker, Magdalena
name: Nakamura, Mitsuhiro
name: Nakano, Toshiyuki
name: Nessi, Marzio
name: Neuhaus, Friedemann
name: Nevay, Laurie
name: Otono, Hidetoshi
name: Pandini, Carlo
name: Pang, Hao
name: Paolozzi, Lorenzo
name: Petersen, Brian
name: Pietropaolo, Francesco
name: Prim, Markus
name: Queitsch-Maitland, Michaela
name: Resnati, Filippo
name: Rizzi, Chiara
name: Rokujo, Hiroki
name: Ruiz-Choliz, Elisa
name: Salfeld-Nebgen, Jakob
name: Sato, Osamu
name: Scampoli, Paola
name: Schmieden, Kristof
name: Schott, Matthias
name: Sfyrla, Anna
name: Shively, Savannah
name: Sipos, Roland
name: Spencer, John
name: Takubo, Yosuke
name: Tarannum, Noshin
name: Theiner, Ondrej
name: Torrence, Eric
name: Tufanli, Serhan
name: Vasina, Svetlana
name: Vormwald, Benedikt
name: Wang, Di
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2021
Subjects: subject: 610
subject: trigger: efficiency
subject: trigger: design
subject: particle: long-lived
subject: data acquisition
subject: CERN LHC Coll
subject: performance
subject: tracking detector
subject: electronics: design
subject: electronics: readout
subject: signal processing
subject: programming
subject: monitoring
subject: Control and monitor systems online
subject: Data acquisition concepts
subject: Trigger concepts and systems (hardware and software)
subject: Detector control systems (detector and experiment monitoring and slow-control systems, architecture, hardware, algorithms, databases)

description: The FASER experiment is a new small and inexpensive experiment that is placed 480 meters downstream of the ATLAS experiment at the CERN LHC. FASER is designed to capture decays of new long-lived particles, produced outside of the ATLAS detector acceptance. These rare particles can decay in the FASER detector together with about 500–1000 Hz of other particles originating from the ATLAS interaction point. A very high efficiency trigger and data acquisition system is required to ensure that the physics events of interest will be recorded. This paper describes the trigger and data acquisition system of the FASER experiment and presents performance results of the system acquired during initial commissioning.