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Metal Foil Detectors assembly for the beam and background monitoring in the LHCb experiment

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arxiv 2503.13629 v3 pith:LQ2BVWNO submitted 2025-03-17 physics.ins-det hep-ex

Metal Foil Detectors assembly for the beam and background monitoring in the LHCb experiment

classification physics.ins-det hep-ex
keywords lhcbdataluminosityrms-r3backgroundbeamdetectorexperiment
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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After an upgrade in 2019--2021, the LHCb experiment is taking data in Run 3 (2022--2026) with an instantaneous luminosity of proton-proton collisions of $2\!\times\!10^{33}$ cm$^{-2}$s$^{-1}$. This article presents the Radiation Monitoring System (RMS-R3) for controlling the beam and background conditions at LHCb. It runs continuously during the detector's operation, and independently of the main LHCb data acquisition. Its design is based on robust and radiation-hard Metal Foil Detector technology. The RMS-R3 monitors the instantaneous luminosity and its evolution. The analysis of the RMS-R3 Run 3 data demonstrates its linear response with a high reproducibility in a five orders of magnitude dynamic range of luminosity over a long period of operation.

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