CERN Accelerating science

Article
Report number arXiv:2406.08712
Title A Novel Diamond-like Carbon based photocathode for PICOSEC Micromegas detectors
Author(s) Wang, X. (USTC, Hefei ; Hefei, CUST) ; Aleksan, R. (IRFU, Saclay) ; Angelis, Y. (Aristotle U., Thessaloniki) ; Bortfeldt, J. (LMU Munich (main)) ; Brunbauer, F. (CERN) ; Brunoldi, M. (Pavia U. ; INFN, Pavia) ; Chatzianagnostou, E. (Aristotle U., Thessaloniki) ; Datta, J. (Stony Brook U.) ; Degmelt, K. (Jefferson Lab) ; Fanourakis, G. (Democritos Nucl. Res. Ctr.) Visa alla 51 författare
Publication 2024-08-12
Imprint 2024-06-12
Number of pages 15
In: JINST 19 (2024) P08010
DOI 10.1088/1748-0221/19/08/P08010
Subject category hep-ex ; Particle Physics - Experiment ; physics.ins-det ; Detectors and Experimental Techniques
Abstract The PICOSEC Micromegas (MM) detector is a precise timing gaseous detector based on a MM detector operating in a two-stage amplification mode and a Cherenkov radiator. Prototypes equipped with cesium iodide (CsI) photocathodes have shown promising time resolutions as precise as 24 picoseconds (ps) for Minimum Ionizing Particles. However, due to the high hygroscopicity and susceptibility to ion bombardment of the CsI photocathodes, alternative photocathode materials are needed to improve the robustness of PICOSEC MM. Diamond-like Carbon (DLC) film have been introduced as a novel robust photocathode material, which have shown promising results. A batch of DLC photocathodes with different thicknesses were produced and evaluated using ultraviolet light. The quantum efficiency measurements indicate that the optimized thickness of the DLC photocathode is approximately 3 nm. Furthermore, DLC photocathodes show good resistance to ion bombardment in aging test compared to the CsI photocathode. Finally, a PICOSEC MM prototype equipped with DLC photocathodes was tested in muon beams. A time resolution of around 42 ps with a detection efficiency of 97% for 150 GeV/c muons were obtained. These results indicate the great potential of DLC as a photocathode for the PICOSEC MM detector.
Copyright/License preprint: (License: CC BY-NC-SA 4.0)
publication: © 2024 CERN (License: CC-BY-4.0)



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 Journalen skapades 2024-07-10, och modifierades senast 2024-11-04


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