Sun, YP (reprint author), Peking Univ, Key Lab Heavy Ion Phys, MOE, Beijing 100871, Peoples R China.
The Beijing Electron and Positron Collider II (BEPCH) is a double ring electron-positron collider, which can also be used as a synchrotron radiation (SR) light source. Since the BEPCH will start commissioning with SR mode in November 2006, it is essential to have a satisfying SR lattice. Here we Erst perform frequency map analysis on the original BEPCH SR lattice. The result shows that the resonance is really severe in the lattice and the transverse motion of particles is unstable. Then a new SR lattice is designed to obtain a large dynamic aperture and much more stable transverse motion. The dynamic aperture of the new lattice including nonlinear wiggler effect is calculated to be very good. This new SR lattice can be used in the commissioning stage of the BEPCH.