harmonic lasing in the lclsii sxr beamline
DESCRIPTION
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). - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Harmonic lasing in the LCLSII SXR beamline](https://reader035.vdocuments.us/reader035/viewer/2022062501/56816069550346895dcf919e/html5/thumbnails/1.jpg)
Harmonic lasing in the LCLSII SXR beamline
G. Marcus, Y. Ding, Z. Huang11/21/2013
![Page 2: Harmonic lasing in the LCLSII SXR beamline](https://reader035.vdocuments.us/reader035/viewer/2022062501/56816069550346895dcf919e/html5/thumbnails/2.jpg)
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)
![Page 3: Harmonic lasing in the LCLSII SXR beamline](https://reader035.vdocuments.us/reader035/viewer/2022062501/56816069550346895dcf919e/html5/thumbnails/3.jpg)
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
![Page 4: Harmonic lasing in the LCLSII SXR beamline](https://reader035.vdocuments.us/reader035/viewer/2022062501/56816069550346895dcf919e/html5/thumbnails/4.jpg)
4
Beamline geometry – nominal layout
Quad Phase shifter Undulator
Modeled in GENESIS using AD parameter in drift
![Page 5: Harmonic lasing in the LCLSII SXR beamline](https://reader035.vdocuments.us/reader035/viewer/2022062501/56816069550346895dcf919e/html5/thumbnails/5.jpg)
5Insert Presentation Title in Slide Master
Simulation parameters – ideal beam
• 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
![Page 6: Harmonic lasing in the LCLSII SXR beamline](https://reader035.vdocuments.us/reader035/viewer/2022062501/56816069550346895dcf919e/html5/thumbnails/6.jpg)
6
Time-dependent, nonlinear harmonics
Psat ~ 2.8 GW
FWHM ~ 0.68 eV
![Page 7: Harmonic lasing in the LCLSII SXR beamline](https://reader035.vdocuments.us/reader035/viewer/2022062501/56816069550346895dcf919e/html5/thumbnails/7.jpg)
7
Time-dependent, nonlinear harmonics
Psat ~ 39 MW
FWHM ~ 1.76 eV
Relative spectral bandwidth is roughly constant5.4e-4 vs 4.7e-4
![Page 8: Harmonic lasing in the LCLSII SXR beamline](https://reader035.vdocuments.us/reader035/viewer/2022062501/56816069550346895dcf919e/html5/thumbnails/8.jpg)
8
Harmonic lasing, phase shift of 2π/3 (λ/3), steady-state
Phase shifters kill the fundamental
![Page 9: Harmonic lasing in the LCLSII SXR beamline](https://reader035.vdocuments.us/reader035/viewer/2022062501/56816069550346895dcf919e/html5/thumbnails/9.jpg)
9
Harmonic lasing, time-dependent
![Page 10: Harmonic lasing in the LCLSII SXR beamline](https://reader035.vdocuments.us/reader035/viewer/2022062501/56816069550346895dcf919e/html5/thumbnails/10.jpg)
10
Beamline geometry – 1 break
![Page 11: Harmonic lasing in the LCLSII SXR beamline](https://reader035.vdocuments.us/reader035/viewer/2022062501/56816069550346895dcf919e/html5/thumbnails/11.jpg)
11
Beamline geometry – 2 breaks
![Page 12: Harmonic lasing in the LCLSII SXR beamline](https://reader035.vdocuments.us/reader035/viewer/2022062501/56816069550346895dcf919e/html5/thumbnails/12.jpg)
12
Beamline geometry – 3 breaks
![Page 13: Harmonic lasing in the LCLSII SXR beamline](https://reader035.vdocuments.us/reader035/viewer/2022062501/56816069550346895dcf919e/html5/thumbnails/13.jpg)
13
Harmonic lasing – 3rd harmonic
P ~ 342 MW FWHM ~ 0.99 eV
![Page 14: Harmonic lasing in the LCLSII SXR beamline](https://reader035.vdocuments.us/reader035/viewer/2022062501/56816069550346895dcf919e/html5/thumbnails/14.jpg)
14
Spectral comparison at saturation points