The CBM Micro-Vertex Detector: Toward production readiness with MIMOSIS MAPS
Abstract
The Compressed Baryonic Matter (CBM) Experiment at FAIR aims to investigate strongly interacting matter in a regime of high net-baryon density and moderate temperature using a fixed-target setup. Its Micro Vertex Detector (MVD) employs CMOS Monolithic Active Pixel Sensor (MAPS), called MIMOSIS, to achieve high-precision tracking and vertex reconstruction close to the interaction point. MAPS offer high spatial resolution, a minimal material budget, and tolerance against radiation, which makes them well-suited candidates for vertexing and tracking in the harsh CBM environment. MIMOSIS features 1024 × 504 pixels with a frame time of 5 μ s and a spatial precision of about 5–6 μ m. The sensors are required to withstand a total ionizing dose (TID) of about 5 MRad and Non-Ionizing Energy Loss (NIEL) equivalent fluences of approximately 7 × 1 0 13 n eq /cm 2 per year of CBM operation. Various prototypes have been developed through a joint R&D effort by IPHC Strasbourg, Goethe University Frankfurt and GSI Darmstadt. This contribution presents the MVD detector concept and results from radiation-tolerance measurements performed on MIMOSIS sensors. We demonstrate that AC-coupled p-stop pixel variant sustains efficiency above 99% and spatial precision of 5–6 μ m up to the combined target dose of CBM (10 14 n eq /cm 2 + 5 MRad), with the 50 μ m-thick epitaxial variant offering a wider operational threshold margin. As the 50- μ m epitaxial is not a production-standard wafer option, the 25 μ m-thick epitaxial p-stop variant is being considered for the pre-production of the MVD, which equally meets the CBM requirement.
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BibTeX
@article{kumar2026microvertex,
title = {{The CBM Micro-Vertex Detector: Toward production readiness with MIMOSIS MAPS}},
author = {Ajit Kumar and Ali-Murteza Altingun and Julio Andary and Benedict Arnoldi-Meadows and Jerome Baudot and Gregory Bertolone and Auguste Besson and Norbert Bialas and Christopher Braun and Roma Bugiel and Gilles Claus and Claude Colledani and Hasan Darwish and Michael Deveaux and Andrei Dorokhov and Guy Dozière and Ziad El Bitar and Ingo Fröhlich and Mathieu Goffe and Benedikt Gutsche and Abdelkader Himmi and Christine Hu-Guo and Kimmo Jaaskelainen and Oliver Keller and Michal Koziel and Franz Matejcek and Jan Michel and Frederic Morel and Christian Müntz and Hung Pham and Christian Joachim Schmidt and Stefan Schreiber and Matthieu Specht and Joachim Stroth and Eva-Dhidho Taka and Isabelle Valin and Roland Weirich and Marc Winter and Yüe Zhao},
journal = {Nucl.Instrum.Meth.A},
year = {2026},
month = sep,
doi = {10.1016/j.nima.2026.171996},
url = {https://hal.science/hal-05746410v1},
note = {CC BY},
}
RIS
TY - JOUR
TI - The CBM Micro-Vertex Detector: Toward production readiness with MIMOSIS MAPS
AU - Ajit Kumar
AU - Ali-Murteza Altingun
AU - Julio Andary
AU - Benedict Arnoldi-Meadows
AU - Jerome Baudot
AU - Gregory Bertolone
AU - Auguste Besson
AU - Norbert Bialas
AU - Christopher Braun
AU - Roma Bugiel
AU - Gilles Claus
AU - Claude Colledani
AU - Hasan Darwish
AU - Michael Deveaux
AU - Andrei Dorokhov
AU - Guy Dozière
AU - Ziad El Bitar
AU - Ingo Fröhlich
AU - Mathieu Goffe
AU - Benedikt Gutsche
AU - Abdelkader Himmi
AU - Christine Hu-Guo
AU - Kimmo Jaaskelainen
AU - Oliver Keller
AU - Michal Koziel
AU - Franz Matejcek
AU - Jan Michel
AU - Frederic Morel
AU - Christian Müntz
AU - Hung Pham
AU - Christian Joachim Schmidt
AU - Stefan Schreiber
AU - Matthieu Specht
AU - Joachim Stroth
AU - Eva-Dhidho Taka
AU - Isabelle Valin
AU - Roland Weirich
AU - Marc Winter
AU - Yüe Zhao
PY - 2026
DA - 2026/09/11
JO - Nucl.Instrum.Meth.A
DO - 10.1016/j.nima.2026.171996
UR - https://hal.science/hal-05746410v1
AB - The Compressed Baryonic Matter (CBM) Experiment at FAIR aims to investigate strongly interacting matter in a regime of high net-baryon density and moderate temperature using a fixed-target setup. Its Micro Vertex Detector (MVD) employs CMOS Monolithic Active Pixel Sensor (MAPS), called MIMOSIS, to achieve high-precision tracking and vertex reconstruction close to the interaction point. MAPS offer high spatial resolution, a minimal material budget, and tolerance against radiation, which makes them well-suited candidates for vertexing and tracking in the harsh CBM environment. MIMOSIS features 1024 × 504 pixels with a frame time of 5 μ s and a spatial precision of about 5–6 μ m. The sensors are required to withstand a total ionizing dose (TID) of about 5 MRad and Non-Ionizing Energy Loss (NIEL) equivalent fluences of approximately 7 × 1 0 13 n eq /cm 2 per year of CBM operation. Various prototypes have been developed through a joint R&D effort by IPHC Strasbourg, Goethe University Frankfurt and GSI Darmstadt. This contribution presents the MVD detector concept and results from radiation-tolerance measurements performed on MIMOSIS sensors. We demonstrate that AC-coupled p-stop pixel variant sustains efficiency above 99% and spatial precision of 5–6 μ m up to the combined target dose of CBM (10 14 n eq /cm 2 + 5 MRad), with the 50 μ m-thick epitaxial variant offering a wider operational threshold margin. As the 50- μ m epitaxial is not a production-standard wafer option, the 25 μ m-thick epitaxial p-stop variant is being considered for the pre-production of the MVD, which equally meets the CBM requirement.
ER -