Short range wake potentials of FLASH resistive tapered collimator and European XFEL undulator intersection

The longitudinally dispersion free hybrid TE/TM numerical scheme is applied for the calculation of short range longitudinal and transverse wake potentials for the FLASH free electron laser facility resistive tapered collimator and European XFEL undulator intersection. All the investigated structures have cylindrical symmetry. The contributions of transitive resistive wakes in loss and kick factors are evaluated. The results are confirmed by the comparison with analytical approximations and other numerical codes.