Study of the quantum efficiency of CsI photocathodes exposed to oxygen and water vapour
May, 20003 pages
Part of Frontier detectors for frontier physics. Proceedings, 8th Pisa Meeting on Advanced Detectors : La Biodola, Italy, May 21-27, 2000, 584-586
Published in:
- Nucl.Instrum.Meth.A 461 (2001) 584-586
Contribution to:
Report number:
- CERN-ALICE-PUB-2000-014,
- CERN-ALI-2000-014
Experiments:
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Abstract: (Elsevier)
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 the ALICE HMPID RICH prototype. Measurements were done through comparison of Cherenkov rings obtained from beam tests. Increased levels of oxygen and water vapour did not show any effect on the performance. The results of this study found a direct application in the way of storing CsI photocathodes over long periods and in particular in the shipment of the HMPID prototype from CERN to the STAR experiment at BNL.- Photocathode
- Cesium iodide
- Quantum efficiency
- Ring imaging detector
- Outgassing
- Water moisture
- talk
- particle identification: (p K pi)
- RICH
- photoelectron: readout
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