Study of the Quantum Efficiency of CsI Photocathodes Exposed to Oxygen and Water Vapour

The operation of CsI photocathodes in gaseous detectors requires special attention to the purity of the applied gas mixtures.We have studied the influence of oxygen and water vapour contaminations on the performance of CsI photocathodes for theALICE HMPID RICH prototype. Measurements were done throu...

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Detalles Bibliográficos
Autores principales: Di Mauro, A, Martinengo, P, Piuz, François, Schyns, E M, Van Beelen, J B, Williams, T D
Lenguaje:eng
Publicado: 2000
Materias:
Detectors and Experimental Techniques
Acceso en línea:http://cds.cern.ch/record/439174
Descripción
Sumario:The operation of CsI photocathodes in gaseous detectors requires special attention to the purity of the applied gas mixtures.We have studied the influence of oxygen and water vapour contaminations on the performance of CsI photocathodes for theALICE HMPID RICH prototype. Measurements were done through comparison of Cherenkov rings obtained from beamtests. Increased levels of oxygen and water vapour did not show any effect on the performance. The results of this studyfound a direct application in the way of storing CsI photocathodes over long periods nad in particular in the shipment of theHMPID prototype from CERN to the STAR experiment at BNL. (Abstract only available,full text to follow)

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