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T: Fachverband Teilchenphysik

T 76: Silicon Detectors VII

T 76.1: Vortrag

Donnerstag, 19. März 2026, 16:15–16:30, KH 01.022

High-resolution timing measurement of a TJ-Monopix2 DMAPS utilizing a 30ps TDC on FPGA implementation — •Rasmus Partzsch, Christian Bespin, Jochen Dingfelder, Fabian Hügging, Hans Krüger, Ramon Leiser, and Lars Schall — Physikalisches Institut der Universität Bonn, Bonn, Germany

The development and characterization of monolithic active pixel sensors with depleted substrates (DMAPS) in the last years lead the way to various applications in future tracking detectors. Increases in luminosity of high-energy physics experiments demand strict timing conditions on the detectors. To enable characterizations with precise timing, an on-FPGA time-to-digital converter utilizing a tapped delay line has been developed achieving a timing resolution down to 30 ps. TJ-Monopix2 is a large-scale DMAPS designed in TowerJazz 180 nm CMOS technology, and features a small charge collection electrode with a pixel size of 33 x 33 um². High-resistivity silicon substrate and high bias voltage capabilities allow for a full depletion of the sensitive volume and fast charge collection enabling operation in high-rate environments, especially after NIEL irradiation. Its successor chip, OBELIX, is designed for the BELLE II vertex detector upgrade (VTX).

This contribution outlines the implementation of the TDC as part of the readout system. Additionally, we present the latest test-beam results for TJ-Monopix2 after irradiation to 1e15 neq/cm² NIEL fluence, focussing on its timing performance.

Keywords: Monolithic; Pixel; FPGA; CMOS; Timing