Analysis and correction of the magnetic field effects in the Hybrid Photo-Detectors of the RICH2 Ring Imaging Cherenkov detector of LHCb

TL;DR

This paper characterizes magnetic field effects on Hybrid Photo-Detectors in LHCb's RICH2 detector and develops correction methods to restore their imaging performance, ensuring accurate particle identification.

Contribution

It introduces a detailed characterization system and correction techniques for magnetic distortions affecting Hybrid Photo-Detectors in the RICH2 detector.

Findings

Magnetic field effects degrade detector imaging quality.

Correction methods successfully restore optimal resolution.

Enhanced particle identification accuracy achieved.

Abstract

The Ring Imaging Cherenkov detectors of the LHCb experiment at the Large Hadron Collider at CERN are equipped with Hybrid Photo-Detectors. These vacuum photo-detectors are affected by the stray magnetic field of the LHCb magnet, which degrades their imaging properties. This effect increases the error on the Cherenkov angle measurement and would reduce the particle identification capabilities of LHCb. A system has been developed for the RICH2 Ring Imaging Cherenkov detector to perform a detailed characterisation of the magnetic distortion effects. It is described, along with the methods implemented to correct for these effects, restoring the optimal resolution.