4.1 Article

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

Journal

PHYSICAL REVIEW ACCELERATORS AND BEAMS
Volume 22, Issue 11, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevAccelBeams.22.110701

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Funding

  1. U.S. Department of Energy [DE-AC02-76SF00515]
  2. U.S. DOE Office of Basic Energy Sciences [2017-SLAC-100382]

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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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