Evaluation of Timepix3 as a luminosity detector at LHC during 2018 pp collisions at s=13 TeV.
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| Title: | Evaluation of Timepix3 as a luminosity detector at LHC during 2018 pp collisions at s=13 TeV. |
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| Authors: | Bergmann, Benedikt1 (AUTHOR) benedikt.bergmann@utef.cvut.cz, Burian, Petr1,2 (AUTHOR), David-Bosne, Eric1 (AUTHOR), Lesmes, Catalina1 (AUTHOR), Pospisil, Stanislav1 (AUTHOR), Smolyanskiy, Petr1 (AUTHOR) |
| Source: | European Physical Journal C -- Particles & Fields. Aug2025, Vol. 85 Issue 8, p1-15. 15p. |
| Subjects: | Luminosity, Large Hadron Collider, Neutron counters, Signal processing, Particle analysis, Proton-proton interactions, Particle physics, Particle detectors |
| Abstract: | Four Timepix3 detectors were installed in the ATLAS experiment at different positions to study their capabilities to measure luminosity during pp-collisions at s = 13 TeV in 2018. While the detectors were operated independently of the ATLAS triggering and acquisition scheme, continuous (dead-time free) measurement together with an orbit clock trigger allowed for synchronization with the LHC. The detectors benefit from a fine segmentation, a pixel pitch of 55 μ m, and a per-pixel time resolution of 1.6 ns allowing for a high-quality track reconstruction and particle identification. One of the 500 μ m thick silicon sensors was equipped with a 6 LiF neutron converter, extending the particle identification capabilities. The installed system was used to study luminosity in different time frames: long term (run-by-run), short term (within a single run) and instantaneous (for each bunch crossing). For the long- and short-term luminosity, partly-independent algorithms: cluster and thermal neutron counting are proposed. A comprehensive analysis of the signal from induced radioactivity and its consecutive removal is presented together with a study demonstrating that the activation-corrected Timepix3 luminosity measurement provides good linearity with respect to the pile-up parameter μ . For measurement of the instantaneous luminosity, a cluster classification scheme was employed to decompose the measured response to the colliding bunch signal. Selecting a subset of the cluster categories, the signal-to-background ratio was improved and the impact of delayed particles from previous bunches could be reduced. Comparisons performed to the primary bunch-by-bunch luminosity measurement of the ATLAS experiment, provided by the LUCID-2 Cherenkov detector, show a good agreement. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | Four Timepix3 detectors were installed in the ATLAS experiment at different positions to study their capabilities to measure luminosity during pp-collisions at s = 13 TeV in 2018. While the detectors were operated independently of the ATLAS triggering and acquisition scheme, continuous (dead-time free) measurement together with an orbit clock trigger allowed for synchronization with the LHC. The detectors benefit from a fine segmentation, a pixel pitch of 55 μ m, and a per-pixel time resolution of 1.6 ns allowing for a high-quality track reconstruction and particle identification. One of the 500 μ m thick silicon sensors was equipped with a 6 LiF neutron converter, extending the particle identification capabilities. The installed system was used to study luminosity in different time frames: long term (run-by-run), short term (within a single run) and instantaneous (for each bunch crossing). For the long- and short-term luminosity, partly-independent algorithms: cluster and thermal neutron counting are proposed. A comprehensive analysis of the signal from induced radioactivity and its consecutive removal is presented together with a study demonstrating that the activation-corrected Timepix3 luminosity measurement provides good linearity with respect to the pile-up parameter μ . For measurement of the instantaneous luminosity, a cluster classification scheme was employed to decompose the measured response to the colliding bunch signal. Selecting a subset of the cluster categories, the signal-to-background ratio was improved and the impact of delayed particles from previous bunches could be reduced. Comparisons performed to the primary bunch-by-bunch luminosity measurement of the ATLAS experiment, provided by the LUCID-2 Cherenkov detector, show a good agreement. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 14346044 |
| DOI: | 10.1140/epjc/s10052-025-14631-x |
