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Soft X-ray seeding studies for the SLAC Linac Coherent Light Source II

  • Author(s): Hemsing, E
  • Marcus, G
  • Fawley, WM
  • Schoenlein, RW
  • Coffee, R
  • Dakovski, G
  • Hastings, J
  • Huang, Z
  • Ratner, D
  • Raubenheimer, T
  • Penn, G
  • et al.
Abstract

We present the results from studies of soft X-ray seeding options for the LCLS-II X-ray free electron laser (FEL) at SLAC. The LCLS-II will use superconducting accelerator technology to produce X-ray pulses at up to 1 MHz repetition rate using 4 GeV electron beams. If properly seeded, these pulses will be nearly fully coherent, and highly stable in photon energy, bandwidth, and intensity, thus enabling unique experiments with intense high-resolution soft X-rays. Given the expected electron beam parameters from start to end simulations and predicted FEL performance, our studies reveal echo enabled harmonic generation (EEHG) and soft X-ray self-seeding (SXRSS) as promising and complementary seeding methods. We find that SXRSS has the advantage of simplicity and will deliver 5-35 times higher spectral brightness than EEHG in the 1-2 nm range, but lacks some of the potential for phase-stable multipulse and multicolor FEL operations enabled by external laser seeding with EEHG.

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