Touschek background and beam lifetime studies for the DAFNE upgrade

For the low energy collider DAPhiNE the machine induced backgrounds into the experiments as well as the beam lifetime are dominated by the Touschek effect. Many efforts have been put in its reduction: by adjusting optical parameters, by inserting additional collimators, as well as by simulating and tracking scattered particles in order to find the proper actions that allow reducing particle losses especially at the interaction region. Studies on the distribution and trajectories of the Touschek particles along the ring are discussed here for the Siddharta run configuration with the crabbed waist scheme, together with an evaluation of the corresponding beam lifetime. Efficiency of the collimators has been investigated with the new machine configuration and new optimized positions along the ring have been found.