SMuK 2023 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 85: DAQ, Data Techniques
T 85.3: Vortrag
Mittwoch, 22. März 2023, 18:00–18:15, HSZ/0301
Firmware for the Mu3e Filter Farm — •Marius Köppel for the Mu3e collaboration — Institute for Nuclear Physics, Johannes Gutenberg University, Mainz Germany
The Mu3e experiment at the Paul Scherrer Institute searches for the decay µ+ → e+ e+ e−. This decay violates charged lepton flavour conservation - any observation would be a clear indication for Physics Beyond the Standard Model. The Mu3e experiment aims for an ultimate sensitivity of one in 1016 µ decays. The first phase of the experiment, currently under construction, will reach a branching ratio sensitivity of 2·10−15 by observing 108 µ decays per second over a year of data taking. The highly granular detector based on thin high-voltage monolithic active pixel sensors (HV-MAPS) and scintillating timing detectors will produce about 100 Gbit/s of data at these particle rates.
Since the corresponding data cannot be saved to disk, a trigger-less online readout system is required which is able to sort, align and analyze the data while running. A farm with PCs equipped with powerful graphics processing units (GPUs) will perform the data reduction. The talk presents the developed firmware used to provide the detector data for the GPU reconstruction. The firmware runs on Field Programmable Gate Arrays (FPGAs), which hold Double Data Rate Synchronous Dynamic Random-Access Memory (DDR SDRAM) to buffer the data. It will also show insides of the online analyzer used to perform data quality checks and other system checks.