Update on the European XFEL RF Power Input Coupler

The European XFEL project [1], [2] is currently being realized in Hamburg, Germany. The 1.5 km 17.5 GeV linear electron accelerator is based on the 1.3 GHz 9-cell TESLA type SRF cavity. The RF power input coupler design for the E-XFEL is based on the well-known TTF3 coupler design, used in the FLASH accelerator at DESY. The coupler design was adapted for industrial production with some parameters optimization revisited and simulations done