The Mu3e Data Acquisition
Heiko Augustin, Niklaus Berger, Alessandro Bravar, Konrad Briggl,, Huangshan Chen, Simon Corrodi, Sebastian Dittmeier, Ben Gayther, Lukas, Gerritzen, Dirk Gottschalk, Ueli Hartmann, Gavin Hesketh, Marius K\"oppel,, Samer Kilani, Alexandr Kozlinskiy, Frank Meier Aeschbacher

TL;DR
The Mu3e data acquisition system is designed to handle high data rates from a particle physics experiment searching for rare muon decays, utilizing advanced sensors, FPGA networks, and GPU-based processing for efficient data filtering and storage.
Contribution
This paper presents the system design and hardware implementation of Mu3e's data acquisition and filter farm, enabling real-time processing of high-rate particle physics data.
Findings
Achieves data reduction from 100 Gbit/s to 100 Mbyte/s
Utilizes FPGA network for high-speed data transport
Employs GPU-based algorithms for track and vertex reconstruction
Abstract
The Mu3e experiment aims to find or exclude the lepton flavour violating decay with a sensitivity of one in 10 muon decays. The first phase of the experiment is currently under construction at the Paul Scherrer Institute (PSI, Switzerland), where beams with up to 10 muons per second are available. The detector will consist of an ultra-thin pixel tracker made from High-Voltage Monolithic Active Pixel Sensors (HV-MAPS), complemented by scintillating tiles and fibres for precise timing measurements. The experiment produces about 100 Gbit/s of zero-suppressed data which are transported to a filter farm using a network of FPGAs and fast optical links. On the filter farm, tracks and three-particle vertices are reconstructed using highly parallel algorithms running on graphics processing units, leading to a reduction of the data to 100 Mbyte/s for mass storage…
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