Speaker
Description
The ring-imaging Cherenkov (RICH) detectors of the LHCb experiment provide charged-particle identification by reconstructing characteristic Cherenkov rings of photons produced when particles traversing gaseous radiators ($C_{4}F_{10}$, $CF_{4}$) exceed the phase velocity of light. These photons are detected by planes of multi-anode photomultiplier tubes (MAPMTs), where precise timing is essential to suppress backgrounds, directly impacting particle identification performance.
Accurate characterisation of the MAPMT time resolution is therefore critical. Previous studies indicate that the time resolution is not uniform across individual channels, implying that photons incident on different regions of a single pixel may be measured with different precision.
This analysis presents a detailed spatial study of the performance of the 2-inch MAPMTs, including inter-channel timing-resolution maps and full-sensor occupancy imaging, together with an investigation of unexpected spatial structures observed in the data.