A SUMMARY OF THE ADVANCED PHOTON SOURCE (APS) SHORT PULSE X-RAY (SPX) R&D ACCOMPLISHMENTS*

The Advanced Photon Source at Argonne conducted R&D on design, fabrication, prototyping, and testing of superconducting deflecting cavities aimed at the production of short x-ray pulses at the Advanced Photon Source. In collaboration with Jefferson National Laboratory, we focused on prototyping and testing a number of single-cell deflecting cavities. At ANL, we designed, prototyped, and tested silicon carbide as damping material for higher-order-mode (HOM) dampers, which are broadband, to handle the HOM power across the frequency spectrum produced by the APS beam. In collaboration with Lawrence Berkeley National Laboratory, we have been developing state-of-the-art timing and synchronization system for distributing stable rf signals over optical fiber capable of achieving tens of femtoseconds phase drift and jitter. Collaboration with the Advanced Computations Department at Stanford Linear Accelerator Center looked into simulations of complex, multi-cavity geometries. This contribution provides a summary report on the accomplishments of the SPX R&D.