Since the discovery of the muon, particle physicists have carried out aseries of experiments aimed at measuring flavor violation in charged-leptoninteractions. To date, no such violation has been observed. The Mu2e experimentat Fermilab will search for the charged lepton flavor violating process ofcoherent muon-to-electron conversion in the presence of a nucleus with asensitivity four orders of magnitude beyond current limits. The experiment willhave a single event sensitivity of about $2.5\times10^{-17}$ while limiting thetotal background to less than 0.5 events. One potential background is due tocosmic-ray muons producing an electron that is indistinguishable from signalwithin the Mu2e apparatus. The cosmic-ray-veto system of the Mu2e experiment istasked with vetoing cosmic-ray-induced backgrounds with high efficiency withoutinducing significant dead time and while operating in a high-intensityenvironment. In this note the challenges related to the high-radiationenvironment that influence the design of the cosmic-ray-veto system will bediscussed.
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