Numerical Validation of the CLIC/SwissFEL/FERMI Multi Purpose X Band Structure

Currently an X-band traveling wave accelerator structure is fabricated in a collaboration between CERN, PSI and Sincrotrone Trieste (ST). PSI and ST will use it in their FEL projects, CERN will test break down limits and rates for high gradients. A special feature of this structure is two integrated wake field monitors monitoring the beam to structure alignment. The design used the classical approach to model individual components and to assume the overall behavior to be the simple superposition of the results. This technique is known to produce valid structure designs. To get a full view of the structure's properties, we followed that by a numerical electromagnetic simulation validation of the full structure to see effects such as internal reflections inside the structure or higher order dispersive terms. Using SLAC's high-performance electromagnetic code suite ACE3P, first results were obtained for the fundamental mode and the lower transverse modes.