Dynamic aperture study on Beijing /spl tau/-Charm Factory design

The Beijing /spl tau/-Charm Factory (BTCF) is a two-ring collider, with the beam energy of 2 GeV, including both crossing-angle and monochromator schemes. Some brief parameters of the ring are shown. The dynamic aperture plays a crucial role in the design of the collider, especially the particle factories. The arrangement of chromaticity sextupoles, which influence the dynamic aperture mainly as considered, is illustrated.