Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 92: Detectors 8 (semiconductors)

T 92.4: Talk

Thursday, March 7, 2024, 16:45–17:00, Geb. 30.23: 2/1

Ultrafast timestamping of charged particles using a digital SiPM — •Stephan Lachnit^1,2, Inge Diehl¹, Finn Feindt¹, Erika Garutti², Karsten Hansen¹, Frauke Poblotzki¹, Daniil Rastorguev^1,3, Simon Spannagel¹, Tomas Vanat¹, and Gianpiero Vignola^1,4 — ¹DESY, Hamburg, Germany — ²Universität Hamburg, Germany — ³Bergische Universität Wuppertal, Germany — ⁴Universität Bonn, Germany

Silicon Photo-Multipliers (SiPMs) have emerged as crucial semiconductor detectors in the realm of single-photon detection and timing. Traditionally analog devices, SiPMs are now evolving with the integration of digital readout techniques akin to monolithic active pixel sensors. This brings forth new possibilities such as full hitmap readout, pixel masking, and on-chip timestamping. In the context of High Energy Physics, the ultrafast O(10 ps) timestamping capabilities of digital SiPMs position them as compelling contenders for 4D tracking applications. However, this requires evaluating the performance of SiPMs in charge particle detection.

At DESY, a digital SiPM has been developed using LFoundry’s 150 nm CMOS process. In this contribution, the analysis of data from a testbeam at DESY-II using 4 GeV electrons is shown. A time resolution of (46 ± 5) ps for the direct detection of electrons at the center of the Single-Photon Avalanche Diode (SPAD) cells has been measured. Variations in response times were observed at the periphery of the SPAD cells.

Keywords: sipm; timing; 4D-tracking; monolithic; digital