Köln 2025 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 21: Instrumentation VI

HK 21.4: Vortrag

Dienstag, 11. März 2025, 16:45–17:00, SR Exp1B Chemie

Microcontroller-based readout for ITS2 Outer Barrel modules — •Bent Buttwill for the ALICE Germany collaboration — Physikalisches Institut Heidelberg, Germany

The Outer Barrel Module (OBM) used in the four outermost layers of the Inner Tracking System (ITS2) of ALICE utilizes 2x7 interconnected ALPIDE monolithic active pixel sensors (MAPS). A number of such modules were integrated on dedicated PCBs to facilitate their use in outreach activities and to serve as large-acceptance detectors in particle telescopes.

A simplified readout using a RP2040 microcontroller was developed for tabletop experiments and successfully utilized in a beam test at the DESY II Test Beam Facility in Hamburg. The setup consisted of three OBM planes placed downstream of a particle telescope made up from single ALPIDE sensors, which operated independently from the OBM modules.

This contribution will discuss the synchronization of hits between the single-ALPIDE telescope and the OBM planes by simply using computer-clock-defined timestamps, enabling combination of data from the two separate data acquisition systems. This approach allows the measurement of the spacing between the ALPIDE chips of an OBM using tracks defined by the upstream telescope.

Keywords: Microcontroller; RP2040; ITS2; Outer Barrel Module; ALICE