Abstract
The performance of a prototype Ring Imaging Cherenkov Detector is studied using a charged particle beam. The detector performance, using CF 4 and air as radiators, is described. Cherenkov angle precision and photoelectron yield using hybrid photo-diodes and multi-anode PMTs agree with simulations and are assessed in terms of the requirements of the LHCb experiment.
Highlights
This paper reports results from a prototype Ring Imaging Cherenkov (RICH) counter and compares the performance of Multi- Anode Photomultiplier tubes (MAPMT) and two types of Hybrid Photo-diode Detectors (HPD) for detecting the Cherenkov photons
The change in signal loss obtained by swapping the width of the pedestal in Cherenkov photon data with that from Light Emitting Diode (LED) data, is taken as a contribution to the systematic error
The photoelectron yield is estimated after applying the threshold cut to the spectrum from the pixels which are selected to be off the Cherenkov ring
Summary
This paper reports results from a prototype Ring Imaging Cherenkov (RICH) counter and compares the performance of Multi- Anode Photomultiplier tubes (MAPMT) and two types of Hybrid Photo-diode Detectors (HPD) for detecting the Cherenkov photons. The downstream detector, RICH2, has 180 cm of CF4 radiator and identifies particles with momenta up to 150 GeV/c It uses a spherical focusing mirror with a radius of curvature of 820 cm which is tilted by 370 mrad to bring the image out of the acceptance of the spectrometer. The LHCb collaboration intends to use arrays of photodetectors with a sensitive granularity of 2.5mm × 2.5mm covering an area of 2.9m2 with a total of 340,000 channels, to detect the Cherenkov photons in both RICH detectors. These photodetectors are expected to cover an active area of at least 70% of the detector plane. 1) Commercial HPD devices from Delft Electronische Producten (DEP), The Netherlands, Commercial MAPMT devices from Hamamatsu Photonics, Japan
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