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We report modeling results for electron cloud buildup and instability in theInternational Linear Collider positron damping ring. Updated optics, wigglermagnets, and vacuum chamber designs have recently been developed for the 5 GeV,3.2-km racetrack layout. An analysis of the synchrotron radiation profilearound the ring has been performed, including the effects of diffuse andspecular photon scattering on the interior surfaces of the vacuum chamber. Theresults provide input to the cloud buildup simulations for the various magneticfield regions of the ring. The modeled cloud densities thus obtained are usedin the instability threshold calculations. We conclude that the mitigationtechniques employed in this model will suffice to allow operation of thedamping ring at the design operational specifications.

Investigation into electron cloud effects in the International Linear Collider positron damping ring