For the SB-Linear-Collider project (SBLC) at DESY a redesign of the damping ring has been performed, mainly in order to optimise the dynamic aperture. The lattice of the proposed damping ring has a DBA structure, similar to the 3rd generation light sources ESRF, APS and SPRING-8. The damping ring is build up with 6 superperiods. The straight sections between these periods are used for the injection, ejection and rf-cavities. In turn, each superperiod consists of 6 DBA cells. The straight sections of these cells are used for the installation of the wigglers, which are needed for the damping. With the installation of overall 150 m of wigglers (B 0 = 2 T and λ 0 = 0.2 m) the equilibrium emittances are ε x,0 = 6.5 • 10 −10 m • rad and ε y,0 = 1.3 • 10 −11 m • rad (the corresponding normalised emittances are : ε x,n = 3.8 • 10 −6 m • rad and ε y,0 = 7.6 • 10 −8 m • rad. The damping time results in τ y ≤ 3.4 ms. The dynamic acceptance including misalignment and magnet errors is in the range of A x ≤ 72 mm • mrad and A y ≤ 80 mm • mrad.
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