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To extend the acceptance of the CMS muon spectrometer to the region 2.4$<|\eta|<$ 2.8, stacks of triple-GEM chambers, forming the ME0 station, areplanned for the CMS Phase 2 Upgrade. These large-area micro-pattern gaseousdetectors must operate in a challenging environment with expected backgroundparticle fluxes up to 150 kHz/cm$^2$. Unlike traditional non-resistive gaseousdetectors, the rate capability of such triple-GEM detectors is limited not byspace charge effects, but by voltage drops on the chamber electrodes due toavalanche-induced currents flowing through the resistive protection circuits(introduced as discharge quenchers). We present a study of the irradiation oflarge-area triple-GEM detectors with moderate fluxes to obtain a highintegrated hit rate. The results show drops as high as 40% of the nominaldetector gas gain, which would result in severe loss of tracking efficiency. Wediscuss possible mitigation strategies leading to a new design for the GEMfoils with electrode segmentation in the radial direction, instead of the"traditional" transverse segmentation. The advantages of the new design includeuniform hit rate across different sectors, minimization of gain-loss withoutthe need for voltage compensation, and independence of detector gain onbackground flux shape.

Rate capability of large-area triple-GEM detectors and new foil design for the innermost station, ME0, of the CMS endcap muon system