Transverse Acceptance Studies at the Atf Damping Ring

The transverse acceptance of the ATF damping ring, estimated from the beam current decay and the timedependent vacuum pressure, is smaller than the design value. We have measured its dependence on sextupole settings, linear coupling, global orbit distortions, local orbit bumps, rf frequency, rf voltage, and on the working point in the tune diagram. We describe the procedure applied to infer the acceptance, present the measurement results and compare them with simulations.