Abstract
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.
Highlights
The FASER experiment at the CERN LHCThe FASER experiment [1, 2] is a new small experiment located along the beam collision axis line of sight (LOS), about 480 m downstream of ATLAS, in the TI12 tunnel in the LHC complex at CERN, as shown in figure 1
This paper describes the trigger and data acquisition system of the FASER experiment and presents performance results of the system acquired during initial commissioning
It is expected from simulations and in-situ measurements [2] that at an instantaneous luminosity of 2 × 1034 cm−2s−1 about 500–1000 Hz of particles, dominated by muons originating from the ATLAS interaction point (IP), will leave signals in the FASER scintillators, while about 5 Hz of energetic signatures will be deposited at the FASER calorimeter
Summary
The FASER experiment [1, 2] is a new small experiment located along the beam collision axis line of sight (LOS), about 480 m downstream of ATLAS, in the TI12 tunnel in the LHC complex at CERN, as shown in figure 1. The detector consists of tracking stations, scintillator stations and a calorimeter It is complemented by additional detector components that constitute the FASERν part of the experiment [5, 6], which aims at precisely measuring cross-sections of neutrinos originating from the ATLAS IP. The third station, or ‘timing station’, is located on the other end of the first magnet and is used to detect the presence of charged particles in the detector It provides a measurement of the arrival time of any charged signal with respect to the p p interaction at the ATLAS IP to a precision of less than 1 ns. The FASER TDAQ system described in this paper is sized to that required for the full detector, including the tracker and scintillator stations corresponding to the FASERν part of the experiment
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