2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/85847The guidelines for a phi-factory at very high luminosity are described. A preliminary design for a double ring collider, DAPHNE-II, is presented, fulfilling the requirements of luminosity of the order of 10^34 cm-2sec-1Invited talk at the Workshop on e+e- in the 1-2 GeV range, Alghero, Italy, September 2003 (eConf C0309101)Accelerator Physicstext