1 / 14

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).

zamora
Télécharger la présentation

Harmonic lasing in the LCLSII SXR beamline

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related