Updates to the International Linear Collider Damping Rings Baseline Design

A new baseline design for the International Linear Collider (ILC) damping rings has been adopted, which reduces the ring circumference to 3.2 km from 6.4 km. This design change is associated with a revised plan to operate the ILC with half the number of bunches originally specified in the ILC Reference Design Report [1]. We describe the lattice selection procedure and the new lattice that has been chosen as a baseline for the shorter ring. In addition, we discuss features of the new design that will allow operation at a 10Hz repetition rate, which is twice the rate specified for baseline operation. Finally, we examine the implications for restoring operation with the originally specified bunch number.