The KLOE detector and physics program

Abstract The KLOE detector, mainly designed to measure the R ( ϵ′ ϵ ) parameter of CP violation in K L decay to an absolute precision of ≈ 10 −4 , is completed and will start data taking by spring 1999 at the e + e − Φ-factory DAΦNE in Frascati. The primary K-meson physics and the experimental requirements at DAΦNE are summarized. The design strategies, the salient features and the main physics performances of all components of the experimental apparatus are reviewed.