CERN Accelerating science

Article
Title	New optics design of the Cherenkov threshold detectors at CERN
Author(s)	Buesa Orgaz, Jan (CERN) ; Schwinzerl, Martin (CERN) ; Bernhard, Johannes (CERN) ; Brugger, Markus (CERN) ; Charitonidis, Nikolaos (CERN) ; Folch, Ramon (CERN) ; Göktürk, Berare (CERN) ; Kadi, Yacine (CERN) ; Nevay, Laurence (CERN) ; Ortega Ruiz, Inaki (CERN) ; Romagnoli, Giulia (CERN) ; Sanchez Galan, Francisco (CERN) ; Van Dijk, Maarten (CERN)
Publication	2023
In:	Proc. SPIE 12696 (2023) 126960E
In:	Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXIII, San Diego, United States, 20 - 24 Aug 2023, pp.126960E
DOI	10.1117/12.2679351
Subject category	Detectors and Experimental Techniques ; Physics in General ; Nuclear Physics - Experiment ; Accelerators and Storage Rings
Abstract	The performance of the Cherenkov threshold detectors (XCET) used in the secondary beam areas (SBA) at CERN is limited by their built-in optics. This study showcases an improved design using compound parabolic concentrators (CPCs) to reduce size and cost of the optics while optimizing the light collection efficiency. The detector was simulated with Geant4 over its full experimental range in terms of pressure, beam momentum, and particle type. The efficiency of the current design was found to be limited by the geometry of the parabolic mirror. The optimized CPC designs resulted in a size reduction of up to 54% and improved photon collection up to 67% compared to the original design when using CO2 as radiator gas and 276% when using R-218. These results highlight the advantages of using CPC and Monte Carlo simulations in the development of Cherenkov threshold detectors and may be useful for further improvements in the next generation of the XCET.
Copyright/License	© 2023 Published by SPIE

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