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Demonstrating CBM Capabilities by $Λ$ Baryon Reconstruction in Ni+Ni Collisions with the mCBM Experiment at SIS18 of GSI/FAIR
Authors:
CBM Collaboration,
A. Agarwal,
Z. Ahammed,
N. Ahmad,
L. J. Ahrens,
M. Al-Turany,
N. Alam,
J. An,
J. Andary,
A. Andronic,
H. Appelshäuser,
B. Arnoldi-Meadows,
B. Artur,
M. D. Azmi,
M. Balzer,
A. Bandyopadhyay,
V. A. Bâsceanu,
J. Becker,
A. Belousov,
A. Bercuci,
R. Berendes,
D. Bertini,
O. Bertini,
M. Beyer,
O. Bezshyyko
, et al. (318 additional authors not shown)
Abstract:
The Compressed Baryonic Matter (CBM) experiment at the upcoming Facility for Antiproton and Ion Research (FAIR) is a high-rate fixed-target experiment designed to investigate nuclear matter at extreme baryon densities in relativistic nucleus-nucleus collisions. To enable high-statistics measurements of rare probes, CBM is designed to operate at event rates up to 10 MHz. This necessitates the devel…
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The Compressed Baryonic Matter (CBM) experiment at the upcoming Facility for Antiproton and Ion Research (FAIR) is a high-rate fixed-target experiment designed to investigate nuclear matter at extreme baryon densities in relativistic nucleus-nucleus collisions. To enable high-statistics measurements of rare probes, CBM is designed to operate at event rates up to 10 MHz. This necessitates the development of fast and radiation-tolerant detectors, self-triggered front-end electronics, a free-streaming data acquisition architecture, and real-time event reconstruction capabilities. Prototype versions and pre-series productions of the CBM detector systems have been deployed in the mini-CBM demonstrator setup mCBM - an experimental precursor comprising sub-components of all major CBM systems, installed at the SIS18 facility of GSI/FAIR within the FAIR Phase-0 program. In 2024, Ni+Ni collisions at a kinetic beam energy of 1.93 AGeV and an average interaction rate of about 250 kHz were successfully recorded. This dataset enables a detailed evaluation of the operational performance of the detector systems as well as the complete CBM data chain, while the reconstruction of rare $Λ$ baryons serves as a natural benchmark. This paper presents the first results on $Λ$ signal reconstruction with the mCBM experiment, demonstrating the readiness of the detector technologies and the data chain for the upcoming full-scale CBM experiment.
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Submitted 1 June, 2026;
originally announced June 2026.
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In beam performances of the MIMOSIS-2.1 CMOS Monolithic Active Pixel Sensor
Authors:
M. Deveaux,
Ali-Murteza Altingun,
Julio Andary,
Benedict Arnoldi-Meadows,
Jerome Baudot,
Gregory Bertolone,
Auguste Besson,
Norbert Bialas,
Christopher Braun,
Roma Bugiel,
Gilles Claus,
Claude Colledani,
Hasan Darwish,
Andrei Dorokhov,
Guy Dozière,
Ziad El Bitar,
Ingo Fröhlich,
Mathieu Goffe,
Benedikt Gutsche,
Abdelkader Himmi,
Christine Hu-Guo,
Kimmo Jaaskelainen,
Oliver Keller,
Michal Koziel,
Franz Matejcek
, et al. (13 additional authors not shown)
Abstract:
MIMOSIS is a CMOS Monolithic Active Pixel Sensor developed to equip the Micro Vertex Detector of the Compressed Baryonic Matter (CBM) experiment at FAIR/GSI. The sensor will combine an excellent spatial precision of $5~μm$ with a time resolution of $5~μs$ and provide a peak hit rate capability of $\mathrm{\sim 80~ MHz/cm^2}$. To fulfill its task, MIMOSIS will have to withstand ionising radiation d…
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MIMOSIS is a CMOS Monolithic Active Pixel Sensor developed to equip the Micro Vertex Detector of the Compressed Baryonic Matter (CBM) experiment at FAIR/GSI. The sensor will combine an excellent spatial precision of $5~μm$ with a time resolution of $5~μs$ and provide a peak hit rate capability of $\mathrm{\sim 80~ MHz/cm^2}$. To fulfill its task, MIMOSIS will have to withstand ionising radiation doses of $\sim 5~ \mathrm{MRad}$ and fluences of $\sim 7 \times 10^{13}~\mathrm{n_{eq}/cm^2}$ per year of operation.
This paper introduces the reticle size full feature sensor prototype MIMOSIS-2.1, which was improved with respect to earlier prototypes by adding on-chip grouping circuts and by improving the analog power grid. Moreover, it features for a first time a $50~μm$ epitaxial layer, which is found to improve the performances of the non-irradiated device significantly. We discuss the in beam sensor performances as measured during beam tests at the CERN-SPS.
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Submitted 7 February, 2025;
originally announced February 2025.
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Integration Concept of the CBM Micro Vertex Detector
Authors:
Franz Matejcek,
Ali-Murteza Altingun,
Julio Andary,
Benedict Arnoldi-Meadows,
Jerome Baudot,
Gregory Bertolone,
Auguste Besson,
Norbert Bialas,
Christopher Braun,
Roma Bugiel,
Gilles Claus,
Claude Colledani,
Hasan Darwish,
Michael Deveaux,
Andrei Dorokhov,
Guy Dozière,
Ziad El Bitar,
Ingo Fröhlich,
Mathieu Goffe,
Benedikt Gutsche,
Abdelkader Himmi,
Christine Hu-Guo,
Kimmo Jaaskelainen,
Oliver Keller,
Michal Koziel
, et al. (13 additional authors not shown)
Abstract:
The Micro Vertex Detector (MVD) is the most upstream detector of the fixed-target Compressed Baryonic Matter Experiment (CBM) at the future Facility for Antiproton and Ion Research (FAIR). It enables high-precision low-momentum tracking in direct proximity of the target. Reaching the stringent requirements for the MVD, a material budget of~$0.3\,-\,0.5\%\,X_0$ per layer, operating the dedicated CM…
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The Micro Vertex Detector (MVD) is the most upstream detector of the fixed-target Compressed Baryonic Matter Experiment (CBM) at the future Facility for Antiproton and Ion Research (FAIR). It enables high-precision low-momentum tracking in direct proximity of the target. Reaching the stringent requirements for the MVD, a material budget of~$0.3\,-\,0.5\%\,X_0$ per layer, operating the dedicated CMOS MAPS~(`MIMOSIS') in the target vacuum, the strong magnetic dipole field, and a harsh radiation environment~(5\,Mrad, $7\times10^{13}\,n_{\text{eq}}/\text{cm}^2$ per CBM year), poses an unprecedented integration challenge. In this paper, the integration concept of the detector is be outlined, elaborating on the selection and preparation of materials, assembly procedures, and quality assessment steps in the ongoing preparation of pre-series production and detector commissioning in 2028.
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Submitted 7 February, 2025;
originally announced February 2025.