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Harmonic lasing in the LCLSII SXR beamline

Harmonic lasing in the LCLSII SXR beamline. G. Marcus, Y. Ding, Z. Huang 11/21/2013. Outline. Motivation Beamline geometry Steady-state analysis 3 rd harmonic Time-dependent GENESIS 3 rd harmonic of E γ = 1.24 keV Various configurations (intra- undulator phase shifts).

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Harmonic lasing in the LCLSII SXR beamline

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  1. Harmonic lasing in the LCLSII SXR beamline G. Marcus, Y. Ding, Z. Huang 11/21/2013

  2. Outline • Motivation • Beamline geometry • Steady-state analysis • 3rd harmonic • Time-dependent GENESIS • 3rd harmonic of Eγ = 1.24 keV • Various configurations (intra-undulator phase shifts)

  3. Motivation • Harmonic lasing can be a cheap and relatively efficient way to extend the photon energy range of a particular FEL beamline • In comparison to nonlinear harmonics, can provide a beam that is more • Intense • Stable • Narrow-band • Suppression by • Phase shifters • Spectral filtering

  4. Beamline geometry – nominal layout Quad Phase shifter Undulator Modeled in GENESIS using AD parameter in drift

  5. Simulation parameters – ideal beam Insert Presentation Title in Slide Master • e-beam • E = 4 GeV • I = 1.0 kA • εn ~ 0.45 μm • σE ~ 500 keV • <β> = 12 m • Undulator • λu= 39 mm • Nper = 85 • L = 3.315 m • Lbreak = 1.17 m (30 per) • Simulated half for slippage • K ~ 2.07 • λr = 1 nm

  6. Time-dependent, nonlinear harmonics Psat ~ 2.8 GW FWHM ~ 0.68 eV

  7. Time-dependent, nonlinear harmonics Psat ~ 39 MW Relative spectral bandwidth is roughly constant 5.4e-4vs 4.7e-4 FWHM ~ 1.76 eV

  8. Harmonic lasing, phase shift of 2π/3 (λ/3), steady-state Phase shifters kill the fundamental

  9. Harmonic lasing, time-dependent

  10. Beamline geometry – 1 break

  11. Beamline geometry – 2 breaks

  12. Beamline geometry – 3 breaks

  13. Harmonic lasing – 3rd harmonic FWHM ~ 0.99 eV P ~ 342 MW

  14. Spectral comparison at saturation points

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