-- RoumyanaHadjiiska - 2019-07-08

Simulation studies of the impact of the CMS radiation environment on RPC detectors

Introduction

RPC hit rate data, with background as main contribution, was collected during proton-proton collisions in 2018. The data presented correspond to an instantaneous luminosity of 1.5e34 cm-2s-1. FLUKA simulation considers a representation of the geometry of the CMS detector used during Run-2 (v.3.31.4.2). GEANT(4.9.6.p04) allows us to simulate in detail the CMS RPC chamber (RE2) located in the second RPC endcap station. The experimental results are compared to a simulation prediction in which FLUKA and GEANT are combined to build a background model.

Figures

sensitivities.png Sensitivity vs Energy for the chambers of the second RPC endcap station (RE2): Monte Carlo estimation of the sensitivity of the double gap RPC detector as a function of the energy of the incident particle for different kinds of particles using GEANT4. Sensitivity is defined as the probability for a background particle to create a signal in at least one of the RPC gas gaps. The background hit rate is calculated by convoluting the sensitivity and the energy spectra. Contact: cms-dpg-conveners-rpc@cernNOSPAMPLEASE.ch

HitRate_vs_R_sim.png Hit Rate for RE2/2 and RE2/3 vs R: Monte Carlo estimation of the the hit rate as a function of the radial distance from the interaction point. The hit rate is defined as the number of particles reaching the RPC station (particle flux) which is convoluted with a detector response (sensitivity) expressed in Hz/cm2. Contact: cms-dpg-conveners-rpc@cernNOSPAMPLEASE.ch

HitRate_vs_eta_sim.png Hit Rate for RE2/2 and RE2/3 vs η: Monte Carlo estimation of the the hit rate as a function of the pseudo rapidity. The hit rate is defined as the number of particles reaching the RPC station (particle flux) which is convoluted with a detector response (sensitivity) expressed in Hz/cm2. Contact: cms-dpg-conveners-rpc@cernNOSPAMPLEASE.ch

HitRate_vs_R_data.png DATA vs MC Comparison as a function of R: Comparison of hit rate as a function of the radial distance of the interaction point between simulation and RPC data collected during 2018. The data and MC agree within a factor of 2. The RPC hit rate is measured at the strip level during LHC pp collision runs. The strip rate is calculated by using the incremental counts of the RPC trigger link boards. The incremental counts are taken during typical time intervals of the order of 100 s. The resulting rates are then averaged over the total runtime and normalized to the strip area. No trigger selection is applied at this stage, resulting in an inclusive measurement of the radiation background rates. Contact: cms-dpg-conveners-rpc@cernNOSPAMPLEASE.ch

HitRate_vs_eta_data.png DATA vs MC Comparison as a function of η: Comparison of hit rate as a function of the pseudorapidity between simulation and RPC data collected during 2018. The data and MC agree within a factor of 2. The RPC hit rate is measured at the strip level during LHC pp collision runs. The strip rate is calculated by using the incremental counts of the RPC trigger link boards. The incremental counts are taken during typical time intervals of the order of 100 s. The resulting rates are then averaged over the total runtime and normalized to the strip area. No trigger selection is applied at this stage, resulting in an inclusive measurement of the radiation background rates. Contact: cms-dpg-conveners-rpc@cernNOSPAMPLEASE.ch

chamber_geant.png Geant4 geometry simulation of double gap RPC: Geant4 geometry simulation of a double gap RPC. Detailed simulation with several layers including: Aluminum FEB (Front-End Board) cover, PCB FEBs FR4, Mylar sheets, copper cooling panels and pipe (including H2O), honey comb aluminum panels (including the peripheral and cross bars), Faraday cage, graphite, Bakelite plates, gas gaps, copper strips, etc. Contact: cms-dpg-conveners-rpc@cernNOSPAMPLEASE.ch
Topic attachments
I Attachment History Action Size Date Who Comment
PNGpng HitRate_vs_R_data.png r1 manage 295.1 K 2019-07-08 - 12:01 RoumyanaHadjiiska  
PNGpng HitRate_vs_R_sim.png r1 manage 381.1 K 2019-07-08 - 12:01 RoumyanaHadjiiska  
PNGpng HitRate_vs_eta_data.png r1 manage 281.7 K 2019-07-08 - 12:01 RoumyanaHadjiiska  
PNGpng HitRate_vs_eta_sim.png r1 manage 374.0 K 2019-07-08 - 12:01 RoumyanaHadjiiska  
PNGpng chamber_geant.png r1 manage 129.0 K 2019-07-08 - 12:39 RoumyanaHadjiiska  
PNGpng sensitivities.png r1 manage 95.3 K 2019-07-08 - 12:01 RoumyanaHadjiiska  
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