2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/86064The DAFNE-II project is considered now as a possible candidate for upgrading the DAFNE electron-positron collider and improving its luminosity. 6D simulation of the DAFNE-II dynamic aperture under various assumptions (weak and strong RF focusing) is presented. Dynamic aperture is reduced as compared to the week focusing case or constant energy deviation due synchrobetatron resonances.Invited talk at the Workshop on e+e- in the 1-2 GeV range, Alghero, Italy, September 2003 (eConf C0309101)Accelerator Physicstext