Proposal on application of the multi-wire proportional chambers of the LHCb MUON Detector at very high rates for the future upgrades

Abstract

The MUON Detector (MD) of LHCb is one of the largest instruments of this kind worldwide, and one of the most irradiated. It has performed exceptionally well during the RUN1 and RUN2 of the LHC at an instantaneous luminosity of 4×10 32 cm −2 s −1 , with tracking inefficiencies at the level of 1% and 2.6%, respectively. Looking forward for the future LHCb Upgrade 2 (U2) planned in 2031 and aiming in running the detector at increased luminosity by factor ∼50, and at the same time keeping a very high (∼99%) detection efficiency, an option with reuse significant part of the present Multi Wire Proportional Chambers (MWPC) in a new Muon System is presented. In addition, the first idea of new Front End Electronics (FEE) and an existing test setup applicable for designing both: new MWPCs with higher granularity of the cathode readout pads and new FEE are described. K : Muon spectrometers; Wire chambers (MWPC); Radiation damage to detector materials (gas detectors).

The LHCb Upgrade I

“…The CARIOCA component is estimated to introduce the dominant contribution to the inefficiency, amounting to ∼8% in M2R1 and ∼4% in M3R1 and M2R2, respectively. New pad detectors with increased granularity have been proposed [155] for these innermost regions to mitigate inefficiency from dead time. A first prototype for an M2R2 chamber, see figure 95 (left), has been designed and constructed in 2016.…”