First demonstration of in-beam performance of bent Monolithic Active Pixel Sensors

0565808 - ÚJF 2023 RIV NL eng J - Journal Article
Aglieri Rinella, G. - Agnello, M. - Alessandro, B. - Agnese, F. - Ferencei, Jozef - Isakov, Artem - Kotliarov, Artem - Křížek, Filip - Kushpil, Svetlana - Vaňát, Tomáš … Total 253 authors
First demonstration of in-beam performance of bent Monolithic Active Pixel Sensors.
Nuclear Instruments & Methods in Physics Research Section A. Roč. 1028, APR (2022), č. článku 166280. ISSN 0168-9002. E-ISSN 1872-9576
R&D Projects: GA MŠMT(CZ) LM2018104
Institutional support: RVO:61389005
Keywords : ALICE ITS * bent sensors * Monolithic Active Pixel Sensors (MAPS * solid state detectors
OECD category: Nuclear related engineering
Impact factor: 1.4, year: 2022
Method of publishing: Limited access
https://doi.org/10.1016/j.nima.2021.166280

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 20-40 μm. To solidify this concept, the feasibility of operating bent MAPS was demonstrated using 1.5cm×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 5.4GeV 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.
Permanent Link: https://hdl.handle.net/11104/0337304