2013/09/12 by Svitozar Serkez, Vitali Kocharyan, Serkez, Svitozar +7
Engineering · Physics and Astronomy · #Accelerator Physics (physics.acc-ph) #Adaptive optics and wavefront sensing #Advanced X-ray Imaging Techniques #FOS: Physical sciences #Particle Accelerators and Free-Electron Lasers #Particle accelerators and beam dynamics
paper · pdf · doi:10.48550/arxiv.1309.3149
openalex publication_date 2013/09/12 · openalex created_date 2022/09/12 · openalex updated_date 2026/07/28
We demonstrate that the output radiation characteristics of the European XFEL\nsources at nominal operation point can be easily made significantly better than\nwhat is currently reported in the TDRs of scientific instruments and X-ray\noptics. In fact, the output SASE characteristics of the baseline European XFEL\nhave been previously optimized assuming uniform undulators at a nominal\noperating point of 5 kA peak current, without considering the potential of\nudulator tapering in the SASE regime. In order to illustrate this point, we\nanalyze the case of an electron bunch with nominal parameters. Based on\nstart-to-end simulations, we demonstrate that nonlinear undulator tapering\nallows one to achieve up to a tenfold increase in peak power and photon\nspectral density in the conventional SASE regime, without modification to the\nbaseline design. The FEL code Genesis has been extensively used for these\nstudies. In order to increase our confidence in simulation results, we\ncross-checked outcomes by reproducing simulations in the deep nonlinear SASE\nregime with tapered undulator using the code ALICE.\n