The e^+e^- collider DAPHNE, expected to begin commissioning in Frascati by the late 1995, is a two-ring machine optimized to run with maximum luminosity at the peak of the ϕ meson, corresponding to a total energy of 1020 MeV/C in the center of mass. This choise for the total energy is motivated by the most important (although by no means the only important) issue in the DAPHNE physics program: the study of the pattern and entity of CP violation in the decay of the ϕ to a final KK ̅pair: the ϕ meson is a pure laboratory for the production of coherent KK ̅states, which makes possible to perform a variety of tests and measurements which have no counterpart for the 'normal' K-or-K ̅production at hadron machines. The whole DAPHNE project poses a number of very hard problems to almost every component of a high-energy physics experiment: from the machine, designed to deliver a luminosity L ∼ 10³2cm^-2 s^-1 shortly after turn-on, to the detector which will have to be able, for the first time in the history of e^+e^- apparata, to reconstruct with high accuracy the decays of long-lived particles like the K+- and K⁰, to the data acquisition system which will be confronted with a 'physics' trigger rate of ∼ 10 KHz. In what follows, I will very skechily describe the machine, already illustrated in much detail in the nice contribution of S. Guiducci to these Proceedings, and will concentrate on the list of physics topics to be addressed, and on the demands imposed to the detector by the characteristics of the events and by the smallness of the effects to be measured.
Calcaterra A. (Mon,) studied this question.