Detection efficiency and spatial resolution of Monolithic Active Pixel Sensors bent to different radii
Bent monolithic active pixel sensors are the basis for the planned fully cylindrical ultra low material budget tracking detector ITS3 of the ALICE experiment. This paper presents results from testbeam campaigns using high-energy particles to verify the performance of 50 μ m thick bent ALPIDE chips in terms of efficiency and spatial resolution. The sensors were bent to radii of 18, 24 and 30 mm, slightly smaller than the foreseen bending radii of the future ALICE ITS3 layers. An efficiency larger than 99.9% and a spatial resolution of approximately 5 μ m, in line with the nominal operation of flat ALPIDE sensors, is obtained at nominal operating conditions. These values are found to be independent of the bending radius and thus constitute an additional milestone in the demonstration of the feasibility of the planned ITS3 detector. In addition, a special geometry in which the beam particles graze the chip and traverse it laterally over distances of up to 3 mm is investigated.
Authors
- L. Lautner (ORCID: https://orcid.org/0000-0002-7017-4183)
- A. Yuncu (ORCID: https://orcid.org/0000-0001-9696-9331)
- Artem Kotliarov (ORCID: https://orcid.org/0000-0003-3576-4185)
- A. Andronic (ORCID: https://orcid.org/0000-0002-2372-6117)
- G. L. Usaı́ (ORCID: https://orcid.org/0000-0002-8659-8378)
- A. Kalweit (ORCID: https://orcid.org/0000-0001-6907-0486)
- D. Colella (ORCID: https://orcid.org/0000-0001-9102-9500)
- Mihail Bogdan Blidaru (ORCID: https://orcid.org/0000-0002-8085-8597)
- P. Becht (ORCID: https://orcid.org/0000-0002-7908-3288)
- M. Šuljić (ORCID: https://orcid.org/0000-0002-4490-1930)
- David Schledewitz (ORCID: https://orcid.org/0009-0006-4641-9765)
- G. Bruno (ORCID: https://orcid.org/0000-0001-6247-9633)
- Berkin Ulukutlu
- Jory Sonneveld (ORCID: https://orcid.org/0000-0001-8362-4414)
- M. Colocci (ORCID: https://orcid.org/0000-0001-7804-0721)
- F. Křížek (ORCID: https://orcid.org/0000-0001-6593-4574)
- M. Mager (ORCID: https://orcid.org/0009-0002-2291-691X)
- F. Carnesecchi (ORCID: https://orcid.org/0000-0001-9981-7536)
- S. Masciocchi (ORCID: https://orcid.org/0000-0002-2064-6517)
- H. Hillemanns (ORCID: https://orcid.org/0000-0002-6527-1245)
- F. Reidt (ORCID: https://orcid.org/0000-0002-5263-3593)
- N. Tiltmann (ORCID: https://orcid.org/0000-0001-8361-3467)
- N. Jacazio (ORCID: https://orcid.org/0000-0002-3066-855X)
- G. Contin (ORCID: https://orcid.org/0000-0001-9504-2702)
- L. Fabbietti (ORCID: https://orcid.org/0000-0002-2325-8368)
- R. Gernhäuser (ORCID: https://orcid.org/0000-0003-1778-4262)
- Marius Wilm Menzel
- Jacob Bastiaan van Beelen
- E. S. Chizzali (ORCID: https://orcid.org/0009-0009-7059-0601)
- A. Mulliri (ORCID: https://orcid.org/0000-0002-1074-5116)
- R. Russo (ORCID: https://orcid.org/0000-0002-7492-974X)
- Y. Wu (ORCID: https://orcid.org/0000-0003-2991-9849)
- S. Senyukov (ORCID: https://orcid.org/0000-0003-1907-9786)
- Arianna Grisel Torres Ramos
- Johanna Stachel (ORCID: https://orcid.org/0000-0003-0750-6664)
- Gilda Scioli (ORCID: https://orcid.org/0000-0003-0144-0713)
- Paolo Martinengo
- R. Ricci (ORCID: https://orcid.org/0000-0002-5208-6657)
- S. Siddhanta (ORCID: https://orcid.org/0000-0002-0543-9245)
- Alex Kluge
Institutions
- University of Trieste (IT)
- GSI Helmholtz Centre for Heavy Ion Research (DE)
- Heidelberg University (DE)
- University of Münster (DE)
- Osservatorio astronomico di Bologna (IT)
- Istituto Nazionale di Fisica Nucleare, Sezione di Bari (IT)
- Istituto Nazionale di Fisica Nucleare, Sezione di Bologna (IT)
- Czech Academy of Sciences, Nuclear Physics Institute (CZ)
- Istituto Nazionale di Fisica Nucleare, Sezione di Trieste (IT)
- Nuclear Research Institute Rez (Czechia) (CZ)
- Technical University of Munich (DE)
- European Organization for Nuclear Research (CH)
- Polytechnic University of Bari (IT)
- University of Bologna (IT)
Publication Details
- Journal
- Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment
- Published
- 2025-11-07
- DOI
- https://doi.org/10.1016/j.nima.2025.171131
- Citations
- 2
- Primary Topic
- Particle Detector Development and Performance
- Type
- article
- Field-Weighted Citation Impact
- 3.74