The DAQ for the Single-Phase DUNE Prototype at CERN

DUNE will be the world's largest neutrino experiment and is due to take data in 2025. This paper describes the data acquisition (DAQ) system for one of its prototypes, ProtoDUNE-SP, which started taking data in Q4 of 2018. ProtoDUNE-SP also breaks records as the largest beam test experiment yet constructed and is a fundamental element of CERN's Neutrino Platform. This makes ProtoDUNE-SP an experiment in its own right and the design and construction have been chosen to meet this scale. Due to the aggressive construction and commissioning timescale, off-the-shelf electronics have been chosen to meet the demands of the experiment where possible. The ProtoDUNE-SP cryostat comprises two primary subdetectors: a single-phase liquid-argon time projection chamber (LAr TPC) and a companion photon detector system. The TPC has two candidate readout solutions under test in ProtoDUNE-SP: RCE (ATCA-based) and Front-End Link EXchange (FELIX) (PCIe-based). Fermilab's artdaq is used as the data handling software framework for the experiment. Custom timing and trigger electronics and software are also described. Triggering and lossless compression will take the 430 Gb/s of data from the front end and reduce it to 20-Gb/s bandwidth to permanent data storage in CERN's EOS infrastructure.