Versatile DBA and TBA lattices for a Tau-Charm factory with and without beam monochromatization

Optics for a high luminosity e+e− collider at a center of mass (CM) energy of 4 GeV, with and without beam monochromatization, using achromatic cells in the arcs have been carefully studied. Two kinds of achromatic cells (double bend achromat and triple bend achromat) have been considered. Chromaticities, dynamic apertures and beam lifetime have also been studied and compared for the two cases.