Author/Authors :
Braem، نويسنده , , A and Davenport، نويسنده , , M and Di Mauro، نويسنده , , A and Martinengo، نويسنده , , P and Nappi، نويسنده , , E and Pai?، نويسنده , , G and Piuz، نويسنده , , F and Schyns، نويسنده , , E، نويسنده ,
Abstract :
The ALICE High-Momentum Particle IDentification RICH detector is equipped with CsI photocathodes (PCs) in a MWPC for the detection of Cherenkov photons. The long-term operational experience with large-area CsI PCs is described. The RICH prototypes have shown a very high stability of operation and performance at a gain of 105 and with rates up to 2×104 cm−2 s−1. When exposure to air is avoided, no degradation of the CsI quantum efficiency has been observed on PCs periodically exposed to test beams over 7 years, corresponding to local integrated charge densities of ∼1 mC/cm2. The results of limited exposures to oxygen and humidity are also presented.
