Reflectivity Studies and Production of New Flat Mirrors for the Cherenkov Threshold Detectors at CERN
J. Buesa Orgaz, M. van Dijk, D. Banerjee, J. Bernhard, M. Brugger, N., Charitonidis, A. Ebn Rahmoun, M. Lazzaroni, V. Marchand, I. Ortega Ruiz, E.G., Parozzi, G. Romagnoli, F. Sanchez Galan, T. Schneider, J. Tan, M. van Stenis
TL;DR
This paper reports on the analysis, design, and testing of new flat mirrors with optimized coatings for Cherenkov detectors at CERN, improving particle identification capabilities in high-energy physics experiments.
Contribution
It introduces a new mirror design and coating process tailored for Cherenkov detectors, with experimental validation through beam tests at CERN.
Findings
Enhanced mirror reflectivity with new coatings
Successful prototype installation and testing at CERN
Improved detector efficiency demonstrated in beam tests
Abstract
Cherenkov threshold detectors (XCET) are used for identifying particles in the experimental areas at CERN. These detectors observe Cherenkov light emitted by charged particles travelling inside a pressurized gas vessel. A key component of the XCET detector is the 45-degree flat mirror reflecting the Cherenkov light towards the photomultiplier (PMT). A thorough analysis and optimization was conducted on the design and materials of this mirror, along with the surface coatings and coating techniques. A suitable manufacturing process was selected, and the first mirror prototype was produced, installed, and tested in the East Area at CERN. Experimental data obtained during beam tests is presented to assess the efficiency of the new coating and materials used.
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