A threshold imaging Cherenkov detector with CsI photocathodes

LHC-B Ring Imaging Cherenkov Detector

Characterization of CsI photocathodes for use in a fast RICH detector

We have completed a series of measurements that provide a basic understanding of the properties of CsI photocathodes for use in ring imaging Cherenkov (RICH) detectors. The quantum efficiency of CsI has been measured relative to an NIST-calibrated photodiode and is in excellent agreement with a similar measurement by Breskin et al. A representative value of the quantum efficiency is 20% at 180 ...

Properties of reflective and semitransparent CsI photocathodes

Various aspects related to the quantum efficiency of the reflective and semitransparent CsI photocathodes have been investigated experimentally . The investigation explored the dependence of the quantum efficiency on the following: the thickness of the photocathode film, the gas used in the parallel-plate avalanche chamber, exposure to water vapor, and the density of the CsI film . With reflect...

Production technique and quality evaluation of CsI photocathodes for the ALICE/HMPID detector

The ALICE/HMPID detector has been equipped with 42 large area CsI photocathodes providing a total of 11m of photosensitive area for the detection of Cherenkov light. This production summary reports on the CsI coating procedure and provides results of the quality monitoring measurements by means of a photocurrent scanner system. The importance of the heat enhancement of CsI PCs is stressed and d...

Helium gas mixtures for ring imaging Cherenkov detectors with Csl photocathodes

In the past few years a readout for Ring-Imaging Cherenkov (RICH) detectors [1] based on CsI photocathodes has been under intensive development [2-15] . The detector is a parallel-plate avalanche chamber (PPAC) with a UV-sensitive solid-CsI photocathode separated by a narrow gap (1-2 mm) from a wire-mesh anode plane (or wire anode plane as in ref. [4]) . The Cherenkov light generated in a radia...