Enhanced coupling design of a detuned damped structure for clic
  The key feature of the improved coupling design in the Damped Detuned Structure (DDS) is focused on the four manifolds. Rectangular geometry slots and rectangular manifolds are used. This results in a significantly stronger coupling to the manifolds compared to the previous design. We describe the new design together with its wakefield damping properties. 
A. D'Elia, R. M. Jones, A. Grudiev, T. Higo, V. F. Khan, W. Wuensch
physics.acc-ph