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An estimate of environmental background hit rate on triple-GEM chambers isperformed using Monte Carlo (MC) simulation and compared to data taken by testchambers installed in the CMS experiment (GE1/1) during Run-2 at the LargeHadron Collider (LHC). The hit rate is measured using data collected withproton-proton collisions at 13 TeV and a luminosity of 1.5$\times10^{34}$cm$^{-2}$ s$^{-1}$. The simulation framework uses a combination of the FLUKAand Geant4 packages to obtain the hit rate. FLUKA provides the radiationenvironment around the GE1/1 chambers, which is comprised of the particle fluxwith momentum direction and energy spectra ranging from $10^{-11}$ to $10^{4}$MeV for neutrons, $10^{-3}$ to $10^{4}$ MeV for $\gamma$'s, $10^{-2}$ to$10^{4}$ MeV for $e^{\pm}$, and $10^{-1}$ to $10^{4}$ MeV for charged hadrons.Geant4 provides an estimate of detector response (sensitivity) based on anaccurate description of detector geometry, material composition and interactionof particles with the various detector layers. The MC simulated hit rate isestimated as a function of the perpendicular distance from the beam line andagrees with data within the assigned uncertainties of 10-14.5%. This simulationframework can be used to obtain a reliable estimate of background ratesexpected at the High Luminosity LHC.

Modeling the triple-GEM detector response to background particles for the CMS Experiment