Erlangen 2026 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 9: Instrumentation II

HK 9.5: Talk

Monday, March 16, 2026, 17:30–17:45, PHIL B 302

Asynchronous Readout for Pixel Detectors — •Tim Stellhorn for the ALICE Germany collaboration — Wilhelm-Klemm Straße 9, 48149 Münster

ALICE 3 is a next-generation high-energy physics experiment for the LHC Run 5. The Outer Tracker (OT) of ALICE 3 will be the largest tracker consisting solely of silicon sensors based on Monolithic Active Pixel Sensors (MAPS) with an active area of 60 m². To meet its requirement of an improved timing resolution of 100 ns, new readout models are investigated. The asynchronous readout approach is based on Asynchronous Priority Arbiters (APAs) and is implemented in the Sensor Pixel Asynchronous Readout CMOS (SPARC) chiplet.

This talk will focus on simulations of the asynchronous readout with the prototyping framework PixESL. A network in PixESL consists of front-end nodes as well as readout nodes and the communication between these nodes is based on the Transaction Level Modelling (TLM) framework of SystemC. The input to PixESL is a list of pixels with recorded hits and the related Time-of-Arrival (ToA) and the Time-over-Threshold (ToT), which is generated in an Allpix-squared simulation. As a result of the PixESL simulation, readout delays of recorded hits from the pixels to the memory of the chip will be analysed depending on different APA tree architectures.

Keywords: ALICE 3; MAPS; SPARC