CERN Accelerating science

Article
Report number arXiv:2105.13000
Title First demonstration of in-beam performance of bent Monolithic Active Pixel Sensors
Author(s) ALICE ITS project Collaboration  Εμφάνιση και των 254 συγγραφέων
Publication 2022-04-01
Imprint 2021-05-27
Number of pages 14
In: Nucl. Instrum. Methods Phys. Res., A 1028 (2022) 166280
DOI 10.1016/j.nima.2021.166280 (publication)
Subject category physics.ins-det ; Detectors and Experimental Techniques
Accelerator/Facility, Experiment CERN LHC ; ALICE
Abstract A novel approach for designing the next generation of vertex detectors foresees to employ wafer-scale sensors that can be bent to truly cylindrical geometries after thinning them to thicknesses of 20-40μm. To solidify this concept, the feasibility of operating bent MAPS was demonstrated using 1.5×3cm ALPIDE chips. Already with their thickness of 50μm, they can be successfully bent to radii of about 2cm without any signs of mechanical or electrical damage. During a subsequent characterisation using a 5.4 GeV electron beam, it was further confirmed that they preserve their full electrical functionality as well as particle detection performance. In this article, the bending procedure and the setup used for characterisation are detailed. Furthermore, the analysis of the beam test, including the measurement of the detection efficiency as a function of beam position and local inclination angle, is discussed. The results show that the sensors maintain their excellent performance after bending to radii of 2cm, with detection efficiencies above 99.9% at typical operating conditions, paving the way towards a new class of detectors with unprecedented low material budget and ideal geometrical properties.
Copyright/License preprint: (License: CC BY 4.0)
publication: © 2021 Published by Elsevier B.V.



Corresponding record in: Inspire


 Δημιουργία εγγραφής 2021-05-28, τελευταία τροποποίηση 2025-01-08


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