Timing performance of the LHCb VELO Timepix3 Telescope
Abstract
We performed a detailed study of the timing performance of the LHCb VELO Timepix3 Telescope with a 180 GeV/c mixed hadron beam at the CERN SPS. A twofold method was developed to improve the resolution of single-plane time measurements, resulting in a more precise overall track time measurement. The first step uses spatial information of reconstructed tracks in combination with the measured signal charge in the sensor to correct for a mixture of different effects: variations in charge carrier drift time; variations in signal induction, which are the result of a non-uniform weighting field in the pixels; and lastly, timewalk in the analog front-end. The second step corrects for systematic timing offsets in Timepix3 that vary from ‑2 to 2 ns. By applying this method, we improved the track time resolution from 438(16) ps to 276(4) ps.
- Publication:
-
Journal of Instrumentation
- Pub Date:
- September 2020
- DOI:
- 10.1088/1748-0221/15/09/P09035
- arXiv:
- arXiv:2008.04801
- Bibcode:
- 2020JInst..15P9035H
- Keywords:
-
- Physics - Instrumentation and Detectors
- E-Print:
- doi:10.1088/1748-0221/15/09/P09035