Characterisation of the first wafer-scale prototype for the ALICE ITS3 upgrade: The monolithic stitched sensor (MOSS)

Omar Abdelrahman; Gianluca Aglieri Rinella; Luca Aglietta; Giacomo Alocco; Matias Antonelli; Roberto Baccomi; Francesco Barile; Pascal Becht; Franco Benotto; Stefania Maria Beolè; Marcello Borri; Daniela Bortoletto; Naseem Bouchhar; Giuseppe Eugenio Bruno; Matthew Daniel Buckland; Szymon Bugiel; Paolo Camerini; Francesca Carnesecchi; Marielle Chartier; Domenico Colella; Angelo Colelli; Giacomo Contin; Giuseppe De Robertis; Wenjing Deng; Antonello Di Mauro; Vittorio Di Trapani; Maurice Donner; Ana Dorda Martin; Piotr Dorosz; Floarea Dumitrache; Lars Döpper; Gregor Hieronymus Eberwein; Domenico Elia; Simone Emiliani; Laura Fabbietti; Tommaso Fagotto; Xiaochao Fang; Henrik Fribert; Roman Gernhäuser; Piero Giubilato; Laura Gonella; Karl Gran Grodaas; Ola Slettevoll Groettvik; Vladimir Gromov; Malte Grönbeck; Philip Hauer; Hartmut Hillemanns; Guen Hee Hong; Yu Hu; Minyoung Chris Hwang; Marc Alain Imhoff; Barbara Jacak; Daniel Matthew Jones; Antoine Junique; Filip Křížek; Jetnipit Kaewjai; Anouk Kaiser; Jesper Karlsson Gumprecht; Markus Keil; Bernhard Ketzer; Jiyoung Kim; Lena Kirchner; Kritsada Kittimanapun; Alex Kluge; Chinorat Kobdaj; Artem Kotliarov; Thanushan Kugathasan; Marc König; Paola La Rocca; Natthawut Laojamnongwong; Lukas Lautner; Corentin Lemoine; Long Li; Beatrice Eva Liang-Gilman; Francesco Licciulli; Sanghoon Lim; Bong Hwi Lim; Jian Liu; Flavio Loddo; Matteo Lupi; Magnus Mager; Philipp Mann; Georgios Mantzaridis; Davide Marras; Paolo Martinengo; Silvia Masciocchi; Annalisa Mastroserio; Soniya Mathew; Serena Mattiazzo; Marius Wilm Menzel; Nicola Minafra; Frederic Morel; Alice Mulliri; Luciano Musa; Anjali Ila Nambrath; Rajendra Nath Patra; Iaroslav Panasenko; Styliani Paniskaki; Caterina Pantouvakis; Cosimo Pastore; Stefania Perciballi; Francesco Piro; Adithya Pulli; Alexander Rachev; Alexander Rachevski; Ivan Ravasenga; Felix Reidt; Michele Rignanese; Giacomo Ripamonti; Isabella Sanna; Valerio Sarritzu; Umberto Savino; Iain Sedgwick; Serhiy Senyukov; Danush Shekar; Sabyasachi Siddhanta; David Silvermyr; Walter Snoeys; Joey Staa; Alessandro Sturniolo; Miljenko Šuljić; Timea Szollosova; Daniel Tapia Takaki; Livia Terlizzi; Nicolas Tiltmann; Antonio Trifirò; Christina Tsolanta; Rosario Turrisi; Berkin Ulukutlu; Gianluca Usai; Isabelle Valin; Giovanni Vecil; Pedro Vicente Leitao; Anna Villani; Chunzheng Wang; Zhenyu Ye; Emma Rose Yeats; Asli Yelkenci; Zijun Zhao; Alessandra Zingaretti

doi:10.1016/j.nima.2026.171297

Characterisation of the first wafer-scale prototype for the ALICE ITS3 upgrade: The monolithic stitched sensor (MOSS)

Omar Abdelrahman
, Gianluca Aglieri Rinella
, Luca Aglietta
, Giacomo Alocco
, Matias Antonelli
, Roberto Baccomi
, Francesco Barile
, Pascal Becht
, Franco Benotto
, Stefania Maria Beolè
, Marcello Borri
, Daniela Bortoletto
, Naseem Bouchhar
, Giuseppe Eugenio Bruno
, Matthew Daniel Buckland
, Szymon Bugiel
, Paolo Camerini
, Francesca Carnesecchi
, Marielle Chartier
, Domenico Colella

Angelo Colelli, Giacomo Contin, Giuseppe De Robertis, Wenjing Deng, Antonello Di Mauro, Vittorio Di Trapani, Maurice Donner, Ana Dorda Martin, Piotr Dorosz, Floarea Dumitrache, Lars Döpper, Gregor Hieronymus Eberwein, Domenico Elia, Simone Emiliani, Laura Fabbietti, Tommaso Fagotto, Xiaochao Fang, Henrik Fribert, Roman Gernhäuser, Piero Giubilato, Laura Gonella, Karl Gran Grodaas, Ola Slettevoll Groettvik, Vladimir Gromov, Malte Grönbeck, Philip Hauer, Hartmut Hillemanns, Guen Hee Hong, Yu Hu, Minyoung Chris Hwang, Marc Alain Imhoff, Barbara Jacak, Daniel Matthew Jones, Antoine Junique, Filip Křížek, Jetnipit Kaewjai, Anouk Kaiser, Jesper Karlsson Gumprecht, Markus Keil, Bernhard Ketzer, Jiyoung Kim, Lena Kirchner, Kritsada Kittimanapun, Alex Kluge, Chinorat Kobdaj, Artem Kotliarov, Thanushan Kugathasan, Marc König, Paola La Rocca, Natthawut Laojamnongwong, Lukas Lautner, Corentin Lemoine, Long Li, Beatrice Eva Liang-Gilman, Francesco Licciulli, Sanghoon Lim, Bong Hwi Lim, Jian Liu, Flavio Loddo, Matteo Lupi, Magnus Mager, Philipp Mann, Georgios Mantzaridis, Davide Marras, Paolo Martinengo, Silvia Masciocchi, Annalisa Mastroserio, Soniya Mathew, Serena Mattiazzo, Marius Wilm Menzel, Nicola Minafra, Frederic Morel, Alice Mulliri, Luciano Musa, Anjali Ila Nambrath, Rajendra Nath Patra, Iaroslav Panasenko, Styliani Paniskaki, Caterina Pantouvakis, Cosimo Pastore, Stefania Perciballi, Francesco Piro, Adithya Pulli, Alexander Rachev, Alexander Rachevski, Ivan Ravasenga, Felix Reidt, Michele Rignanese, Giacomo Ripamonti, Isabella Sanna, Valerio Sarritzu, Umberto Savino, Iain Sedgwick, Serhiy Senyukov, Danush Shekar, Sabyasachi Siddhanta, David Silvermyr, Walter Snoeys, Joey Staa, Alessandro Sturniolo, Miljenko Šuljić, Timea Szollosova, Daniel Tapia Takaki, Livia Terlizzi, Nicolas Tiltmann, Antonio Trifirò, Christina Tsolanta, Rosario Turrisi, Berkin Ulukutlu, Gianluca Usai, Isabelle Valin, Giovanni Vecil, Pedro Vicente Leitao, Anna Villani, Chunzheng Wang, Zhenyu Ye, Emma Rose Yeats, Asli Yelkenci, Zijun Zhao, Alessandra Zingaretti

Chair of Experimentalphysik - Dense and Strange Hadronic Matter

Technical University of Munich
European Organisation for Nuclear Research (CERN)
University of Torino
INFN Sez. di Torino
University of Trieste Via A
INFN- Sezione di Trieste
Dipartimento Interateneo di Fisica M. Merlin
Istituto Nazionale di Fisica Nucleare, Sezione di Bari
Heidelberg University
STFC Daresbury Laboratory
University of Oxford
Sejong University
University of Liverpool
Central China Normal University
Rheinische Friedrich-Wilhelms-Universität Bonn
Institut de Neurosciences de la Timone, Centre National de la Recherche Scientifique - Aix-Marseille University
University of Padova
Dipartimento di Fisica 'G. Galilei' and INFN
Norwegian University of Science and Technology
Science Park 105
Yonsei University
Lawrence Berkeley National Laboratory
University of California at Berkeley
Nuclear Physics Institute of the Cas
Suranaree University of Technology
Lund University
Inha University
Nakhon Ratchasima
Aarhus University
Università di Catania
Laboratori Nazionali Del Sud
University of Birmingham
Pusan National University
University of Tokyo
University of Cagliari
Sezione INFN di Cagliari
University of Foggia
University of Kansas
École Polytechnique Fédérale de Lausanne (EPFL)
UIC ECE-CSN-Lab
Czech Technical University in Prague
University of Münster
University of Oslo
Fudan University

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

This paper presents the characterisation and testing of the first wafer-scale monolithic stitched sensor (MOSS) prototype developed for the ALICE ITS3 upgrade that is to be installed during the LHC Long Shutdown 3 (2026–2030). The MOSS chip design is driven by the truly cylindrical detector geometry that imposes that each layer is built out of two wafer-sized, bent silicon chips. The stitching technique is employed to fabricate sensors with dimensions of 1.4 cm × 25.9 cm, thinned to 50 μm. The chip architecture, the in-pixel front-end, the laboratory and in-beam characterisation, the susceptibility to single-event effects, and the series testing are discussed. The testing campaign validates the design of a wafer-scale stitched sensor and the performance of the pixel matrix to be within the ITS3 requirements. The MOSS chip demonstrates the feasibility of the ITS3 detector concept and provides insights for further optimisation and development.

Original language	English
Article number	171297
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	1086
DOIs	https://doi.org/10.1016/j.nima.2026.171297
State	Published - Jun 2026

Keywords

CMOS stitching
Monolithic active pixel sensors
Silicon sensors
Solid state detectors

Access to Document

10.1016/j.nima.2026.171297

Cite this

Abdelrahman, O., Rinella, G. A., Aglietta, L., Alocco, G., Antonelli, M., Baccomi, R., Barile, F., Becht, P., Benotto, F., Beolè, S. M., Borri, M., Bortoletto, D., Bouchhar, N., Bruno, G. E., Buckland, M. D., Bugiel, S., Camerini, P., Carnesecchi, F., Chartier, M., ... Zingaretti, A. (2026). Characterisation of the first wafer-scale prototype for the ALICE ITS3 upgrade: The monolithic stitched sensor (MOSS). Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1086, Article 171297. https://doi.org/10.1016/j.nima.2026.171297

@article{ac30da78af2b48fb9552d56e5e8dbe74,

title = "Characterisation of the first wafer-scale prototype for the ALICE ITS3 upgrade: The monolithic stitched sensor (MOSS)",

abstract = "This paper presents the characterisation and testing of the first wafer-scale monolithic stitched sensor (MOSS) prototype developed for the ALICE ITS3 upgrade that is to be installed during the LHC Long Shutdown 3 (2026{\textendash}2030). The MOSS chip design is driven by the truly cylindrical detector geometry that imposes that each layer is built out of two wafer-sized, bent silicon chips. The stitching technique is employed to fabricate sensors with dimensions of 1.4 cm {\texttimes} 25.9 cm, thinned to 50 μm. The chip architecture, the in-pixel front-end, the laboratory and in-beam characterisation, the susceptibility to single-event effects, and the series testing are discussed. The testing campaign validates the design of a wafer-scale stitched sensor and the performance of the pixel matrix to be within the ITS3 requirements. The MOSS chip demonstrates the feasibility of the ITS3 detector concept and provides insights for further optimisation and development.",

keywords = "CMOS stitching, Monolithic active pixel sensors, Silicon sensors, Solid state detectors",

author = "Omar Abdelrahman and Rinella, \{Gianluca Aglieri\} and Luca Aglietta and Giacomo Alocco and Matias Antonelli and Roberto Baccomi and Francesco Barile and Pascal Becht and Franco Benotto and Beol{\`e}, \{Stefania Maria\} and Marcello Borri and Daniela Bortoletto and Naseem Bouchhar and Bruno, \{Giuseppe Eugenio\} and Buckland, \{Matthew Daniel\} and Szymon Bugiel and Paolo Camerini and Francesca Carnesecchi and Marielle Chartier and Domenico Colella and Angelo Colelli and Giacomo Contin and \{De Robertis\}, Giuseppe and Wenjing Deng and \{Di Mauro\}, Antonello and \{Di Trapani\}, Vittorio and Maurice Donner and Martin, \{Ana Dorda\} and Piotr Dorosz and Floarea Dumitrache and Lars D{\"o}pper and Eberwein, \{Gregor Hieronymus\} and Domenico Elia and Simone Emiliani and Laura Fabbietti and Tommaso Fagotto and Xiaochao Fang and Henrik Fribert and Roman Gernh{\"a}user and Piero Giubilato and Laura Gonella and Grodaas, \{Karl Gran\} and Groettvik, \{Ola Slettevoll\} and Vladimir Gromov and Malte Gr{\"o}nbeck and Philip Hauer and Hartmut Hillemanns and Hong, \{Guen Hee\} and Yu Hu and Hwang, \{Minyoung Chris\} and Imhoff, \{Marc Alain\} and Barbara Jacak and Jones, \{Daniel Matthew\} and Antoine Junique and Filip K{\v r}{\'i}{\v z}ek and Jetnipit Kaewjai and Anouk Kaiser and Gumprecht, \{Jesper Karlsson\} and Markus Keil and Bernhard Ketzer and Jiyoung Kim and Lena Kirchner and Kritsada Kittimanapun and Alex Kluge and Chinorat Kobdaj and Artem Kotliarov and Thanushan Kugathasan and Marc K{\"o}nig and Rocca, \{Paola La\} and Natthawut Laojamnongwong and Lukas Lautner and Corentin Lemoine and Long Li and Liang-Gilman, \{Beatrice Eva\} and Francesco Licciulli and Sanghoon Lim and Lim, \{Bong Hwi\} and Jian Liu and Flavio Loddo and Matteo Lupi and Magnus Mager and Philipp Mann and Georgios Mantzaridis and Davide Marras and Paolo Martinengo and Silvia Masciocchi and Annalisa Mastroserio and Soniya Mathew and Serena Mattiazzo and Menzel, \{Marius Wilm\} and Nicola Minafra and Frederic Morel and Alice Mulliri and Luciano Musa and Nambrath, \{Anjali Ila\} and Patra, \{Rajendra Nath\} and Iaroslav Panasenko and Styliani Paniskaki and Caterina Pantouvakis and Cosimo Pastore and Stefania Perciballi and Francesco Piro and Adithya Pulli and Alexander Rachev and Alexander Rachevski and Ivan Ravasenga and Felix Reidt and Michele Rignanese and Giacomo Ripamonti and Isabella Sanna and Valerio Sarritzu and Umberto Savino and Iain Sedgwick and Serhiy Senyukov and Danush Shekar and Sabyasachi Siddhanta and David Silvermyr and Walter Snoeys and Joey Staa and Alessandro Sturniolo and Miljenko {\v S}ulji{\'c} and Timea Szollosova and Takaki, \{Daniel Tapia\} and Livia Terlizzi and Nicolas Tiltmann and Antonio Trifir{\`o} and Christina Tsolanta and Rosario Turrisi and Berkin Ulukutlu and Gianluca Usai and Isabelle Valin and Giovanni Vecil and Leitao, \{Pedro Vicente\} and Anna Villani and Chunzheng Wang and Zhenyu Ye and Yeats, \{Emma Rose\} and Asli Yelkenci and Zijun Zhao and Alessandra Zingaretti",

note = "Publisher Copyright: {\textcopyright} 2026 The Authors",

year = "2026",

month = jun,

doi = "10.1016/j.nima.2026.171297",

language = "English",

volume = "1086",

journal = "Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment",

issn = "0168-9002",

publisher = "Elsevier B.V.",

}

Abdelrahman, O, Rinella, GA, Aglietta, L, Alocco, G, Antonelli, M, Baccomi, R, Barile, F, Becht, P, Benotto, F, Beolè, SM, Borri, M, Bortoletto, D, Bouchhar, N, Bruno, GE, Buckland, MD, Bugiel, S, Camerini, P, Carnesecchi, F, Chartier, M, Colella, D, Colelli, A, Contin, G, De Robertis, G, Deng, W, Di Mauro, A, Di Trapani, V, Donner, M, Martin, AD, Dorosz, P, Dumitrache, F, Döpper, L, Eberwein, GH, Elia, D, Emiliani, S, Fabbietti, L, Fagotto, T, Fang, X, Fribert, H, Gernhäuser, R, Giubilato, P, Gonella, L, Grodaas, KG, Groettvik, OS, Gromov, V, Grönbeck, M, Hauer, P, Hillemanns, H, Hong, GH, Hu, Y, Hwang, MC, Imhoff, MA, Jacak, B, Jones, DM, Junique, A, Křížek, F, Kaewjai, J, Kaiser, A, Gumprecht, JK, Keil, M, Ketzer, B, Kim, J, Kirchner, L, Kittimanapun, K, Kluge, A, Kobdaj, C, Kotliarov, A, Kugathasan, T, König, M, Rocca, PL, Laojamnongwong, N, Lautner, L, Lemoine, C, Li, L, Liang-Gilman, BE, Licciulli, F, Lim, S, Lim, BH, Liu, J, Loddo, F, Lupi, M, Mager, M, Mann, P, Mantzaridis, G, Marras, D, Martinengo, P, Masciocchi, S, Mastroserio, A, Mathew, S, Mattiazzo, S, Menzel, MW, Minafra, N, Morel, F, Mulliri, A, Musa, L, Nambrath, AI, Patra, RN, Panasenko, I, Paniskaki, S, Pantouvakis, C, Pastore, C, Perciballi, S, Piro, F, Pulli, A, Rachev, A, Rachevski, A, Ravasenga, I, Reidt, F, Rignanese, M, Ripamonti, G, Sanna, I, Sarritzu, V, Savino, U, Sedgwick, I, Senyukov, S, Shekar, D, Siddhanta, S, Silvermyr, D, Snoeys, W, Staa, J, Sturniolo, A, Šuljić, M, Szollosova, T, Takaki, DT, Terlizzi, L, Tiltmann, N, Trifirò, A, Tsolanta, C, Turrisi, R, Ulukutlu, B, Usai, G, Valin, I, Vecil, G, Leitao, PV, Villani, A, Wang, C, Ye, Z, Yeats, ER, Yelkenci, A, Zhao, Z & Zingaretti, A 2026, 'Characterisation of the first wafer-scale prototype for the ALICE ITS3 upgrade: The monolithic stitched sensor (MOSS)', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 1086, 171297. https://doi.org/10.1016/j.nima.2026.171297

Characterisation of the first wafer-scale prototype for the ALICE ITS3 upgrade: The monolithic stitched sensor (MOSS). / Abdelrahman, Omar; Rinella, Gianluca Aglieri; Aglietta, Luca et al.
In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 1086, 171297, 06.2026.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Characterisation of the first wafer-scale prototype for the ALICE ITS3 upgrade

T2 - The monolithic stitched sensor (MOSS)

AU - Abdelrahman, Omar

AU - Rinella, Gianluca Aglieri

AU - Aglietta, Luca

AU - Alocco, Giacomo

AU - Antonelli, Matias

AU - Baccomi, Roberto

AU - Barile, Francesco

AU - Becht, Pascal

AU - Benotto, Franco

AU - Beolè, Stefania Maria

AU - Borri, Marcello

AU - Bortoletto, Daniela

AU - Bouchhar, Naseem

AU - Bruno, Giuseppe Eugenio

AU - Buckland, Matthew Daniel

AU - Bugiel, Szymon

AU - Camerini, Paolo

AU - Carnesecchi, Francesca

AU - Chartier, Marielle

AU - Colella, Domenico

AU - Colelli, Angelo

AU - Contin, Giacomo

AU - De Robertis, Giuseppe

AU - Deng, Wenjing

AU - Di Mauro, Antonello

AU - Di Trapani, Vittorio

AU - Donner, Maurice

AU - Martin, Ana Dorda

AU - Dorosz, Piotr

AU - Dumitrache, Floarea

AU - Döpper, Lars

AU - Eberwein, Gregor Hieronymus

AU - Elia, Domenico

AU - Emiliani, Simone

AU - Fabbietti, Laura

AU - Fagotto, Tommaso

AU - Fang, Xiaochao

AU - Fribert, Henrik

AU - Gernhäuser, Roman

AU - Giubilato, Piero

AU - Gonella, Laura

AU - Grodaas, Karl Gran

AU - Groettvik, Ola Slettevoll

AU - Gromov, Vladimir

AU - Grönbeck, Malte

AU - Hauer, Philip

AU - Hillemanns, Hartmut

AU - Hong, Guen Hee

AU - Hu, Yu

AU - Hwang, Minyoung Chris

AU - Imhoff, Marc Alain

AU - Jacak, Barbara

AU - Jones, Daniel Matthew

AU - Junique, Antoine

AU - Křížek, Filip

AU - Kaewjai, Jetnipit

AU - Kaiser, Anouk

AU - Gumprecht, Jesper Karlsson

AU - Keil, Markus

AU - Ketzer, Bernhard

AU - Kim, Jiyoung

AU - Kirchner, Lena

AU - Kittimanapun, Kritsada

AU - Kluge, Alex

AU - Kobdaj, Chinorat

AU - Kotliarov, Artem

AU - Kugathasan, Thanushan

AU - König, Marc

AU - Rocca, Paola La

AU - Laojamnongwong, Natthawut

AU - Lautner, Lukas

AU - Lemoine, Corentin

AU - Li, Long

AU - Liang-Gilman, Beatrice Eva

AU - Licciulli, Francesco

AU - Lim, Sanghoon

AU - Lim, Bong Hwi

AU - Liu, Jian

AU - Loddo, Flavio

AU - Lupi, Matteo

AU - Mager, Magnus

AU - Mann, Philipp

AU - Mantzaridis, Georgios

AU - Marras, Davide

AU - Martinengo, Paolo

AU - Masciocchi, Silvia

AU - Mastroserio, Annalisa

AU - Mathew, Soniya

AU - Mattiazzo, Serena

AU - Menzel, Marius Wilm

AU - Minafra, Nicola

AU - Morel, Frederic

AU - Mulliri, Alice

AU - Musa, Luciano

AU - Nambrath, Anjali Ila

AU - Patra, Rajendra Nath

AU - Panasenko, Iaroslav

AU - Paniskaki, Styliani

AU - Pantouvakis, Caterina

AU - Pastore, Cosimo

AU - Perciballi, Stefania

AU - Piro, Francesco

AU - Pulli, Adithya

AU - Rachev, Alexander

AU - Rachevski, Alexander

AU - Ravasenga, Ivan

AU - Reidt, Felix

AU - Rignanese, Michele

AU - Ripamonti, Giacomo

AU - Sanna, Isabella

AU - Sarritzu, Valerio

AU - Savino, Umberto

AU - Sedgwick, Iain

AU - Senyukov, Serhiy

AU - Shekar, Danush

AU - Siddhanta, Sabyasachi

AU - Silvermyr, David

AU - Snoeys, Walter

AU - Staa, Joey

AU - Sturniolo, Alessandro

AU - Šuljić, Miljenko

AU - Szollosova, Timea

AU - Takaki, Daniel Tapia

AU - Terlizzi, Livia

AU - Tiltmann, Nicolas

AU - Trifirò, Antonio

AU - Tsolanta, Christina

AU - Turrisi, Rosario

AU - Ulukutlu, Berkin

AU - Usai, Gianluca

AU - Valin, Isabelle

AU - Vecil, Giovanni

AU - Leitao, Pedro Vicente

AU - Villani, Anna

AU - Wang, Chunzheng

AU - Ye, Zhenyu

AU - Yeats, Emma Rose

AU - Yelkenci, Asli

AU - Zhao, Zijun

AU - Zingaretti, Alessandra

PY - 2026/6

Y1 - 2026/6

N2 - This paper presents the characterisation and testing of the first wafer-scale monolithic stitched sensor (MOSS) prototype developed for the ALICE ITS3 upgrade that is to be installed during the LHC Long Shutdown 3 (2026–2030). The MOSS chip design is driven by the truly cylindrical detector geometry that imposes that each layer is built out of two wafer-sized, bent silicon chips. The stitching technique is employed to fabricate sensors with dimensions of 1.4 cm × 25.9 cm, thinned to 50 μm. The chip architecture, the in-pixel front-end, the laboratory and in-beam characterisation, the susceptibility to single-event effects, and the series testing are discussed. The testing campaign validates the design of a wafer-scale stitched sensor and the performance of the pixel matrix to be within the ITS3 requirements. The MOSS chip demonstrates the feasibility of the ITS3 detector concept and provides insights for further optimisation and development.

AB - This paper presents the characterisation and testing of the first wafer-scale monolithic stitched sensor (MOSS) prototype developed for the ALICE ITS3 upgrade that is to be installed during the LHC Long Shutdown 3 (2026–2030). The MOSS chip design is driven by the truly cylindrical detector geometry that imposes that each layer is built out of two wafer-sized, bent silicon chips. The stitching technique is employed to fabricate sensors with dimensions of 1.4 cm × 25.9 cm, thinned to 50 μm. The chip architecture, the in-pixel front-end, the laboratory and in-beam characterisation, the susceptibility to single-event effects, and the series testing are discussed. The testing campaign validates the design of a wafer-scale stitched sensor and the performance of the pixel matrix to be within the ITS3 requirements. The MOSS chip demonstrates the feasibility of the ITS3 detector concept and provides insights for further optimisation and development.

KW - CMOS stitching

KW - Monolithic active pixel sensors

KW - Silicon sensors

KW - Solid state detectors

UR - https://www.scopus.com/pages/publications/105028898645

U2 - 10.1016/j.nima.2026.171297

DO - 10.1016/j.nima.2026.171297

M3 - Article

AN - SCOPUS:105028898645

SN - 0168-9002

VL - 1086

JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

M1 - 171297

ER -

Abdelrahman O, Rinella GA, Aglietta L, Alocco G, Antonelli M, Baccomi R et al. Characterisation of the first wafer-scale prototype for the ALICE ITS3 upgrade: The monolithic stitched sensor (MOSS). Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2026 Jun;1086:171297. doi: 10.1016/j.nima.2026.171297

Characterisation of the first wafer-scale prototype for the ALICE ITS3 upgrade: The monolithic stitched sensor (MOSS)

Abstract

Keywords

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