Progress of the Development of a Superconducting Undulator as a THz Source for FELs

To produce radiation in the THz frequency range at X-ray Free Electron
Lasers, undulators with large period length, high fields, and large gaps are
required. These demands can be fulfilled by superconducting undulators. In
this contribution, the actual requirements on the main parameters of such a
superconducting undulator will be discussed and the progress of the design
will be discussed. In addition, beam impedance and heat load results obtained
analytically as well as by large-scale wakefield simulations will be presented.