Mu2e at Fermilab will search for charged lepton flavor violation via the
coherent conversion process mu- N --> e- N with a sensitivity approximately
four orders of magnitude better than the current world's best limits for this
process. The experiment's sensitivity offers discovery potential over a wide
array of new physics models and probes mass scales well beyond the reach of the
LHC. We describe herein the conceptual design of the proposed Mu2e experiment.
This document was created in partial fulfillment of the requirements necessary
to obtain DOE CD-1 approval, which was granted July 11, 2012.