OPERATIONAL STATUS OF CESR-c

We summarize recent running experience at the Cor-nell Electron Storage Ring (CESR) operating as a high-statistics production-threshold factory for mesons contain-ing charm quarks. Since beginning operation at beam en-ergies near 2 GeV in late 2003, CESR has accumulated world-record samples of D and D s meson decays and has also operated in an energy-scanning mode, making unique contributions to the presently very active field of charm spectroscopy. CESR lattice design is characterized by the versatility provided by the variety of beam-line compo-nents applied to the challenges imposed by the beam-beam interactions at the parasitic crossing points in the pretzel or-bits and the necessity of powerful superconducting wiggler magnets used to tune damping and emittance. We describe the observed tune-plane, beam-current and luminosity lim-its, our understanding of their sources and near-term plans for operational improvements