Functionality features of the RMS-R3 system in the third physics run of the LHCb experiment

Abstract

The upgraded LHCb detector allows the collection of data in the third physics run at instantaneous luminosity up to 2·1033 cm-2s-1 in proton-proton collisions at energy up to 14 TeV. A set of high-speed monitoring systems, including the RMS-R3 system, which monitors the nuclear interactions in the interaction region of the IP-8 (LHCb) experiment and the background, ensures the effective conduct of the experiment. An important functional characteristic of this system is the observation of luminosity stability over a wide dynamic range, which in its upper limit provides a linear response at ten times the nominal luminosity. This paper illustrates a new functionality feature of the RMS-R3, which is its ability to produce highly accurate data on the localization of the physical events of nuclear collisions in the interaction region of the experiment. The data measured in 2022 - 2023 allow us to observe the parameter variation impact of the nucleus-nucleus average number interactions in a single bunch crossing of the beams, the change of the state of the VELO detector and the injection of gaseous target SMOG2 by different gases.

Keywords

• lhcb experiment
• luminosity and background monitoring system
• monitoring of interaction region by asymmetry method of system response.