Simulation study of low emittance tuning of the Accelerator Test Facility damping ring at KEK

For damping rings of future linear colliders, extremely low vertical emittance will be required. In an electron circular accelerator, the dominant sources of the vertical emittance are the vertical dispersion in arc sections and the x−y orbit coupling, caused by various errors. A systematic method to correct the vertical dispersion and the orbit coupling based on beam position measurement has been developed. In this paper, simulation studies assuming realistic misalignments, performances of monitors, and correctors of the Accelerator Test Facility damping ring at KEK are presented.