Analytical and time-domain computations of single bunch loss-factor in a planar structure

An analytical formulation is developed for a Gaussian bunch loss-factor in a periodic planar ("muffin-tin") structure. The short-range wakefield contribution is modeled with diffraction pattern expanded in a sum of quasi-eigenmodes of an equivalent open waveguide, which is excited by charge "image" fields induced on the iris edges. Comparisons with GdfidL time-domain multi-cell 3D simulations demonstrate a good accuracy of the model. Transverse wakes are computed numerically