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Undulator length for TW FEL

Undulator length for TW FEL. Studies performed by Juhao Wu Presented by Tor Raubenheimer. Initial Simulations for a TW FEL. Study what undulator length is necessary for TW-FEL operating at: 8 keV , 13 keV and 18 keV Studied seed power dependance in the past  1 ~ 5 MW

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Undulator length for TW FEL

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  1. Undulator length for TW FEL Studies performed by Juhao Wu Presented by Tor Raubenheimer

  2. Initial Simulations for a TW FEL Study what undulator length is necessary for TW-FEL operating at: 8 keV, 13 keV and 18 keV Studied seed power dependance in the past  1 ~ 5 MW Varied the seed undulator length from 9 to 11 undulators (39 ~ 48 meters) Monochromator is modeled as a filter (typically 0.1% eff.) Optimized TW taper for 3 different lengths (150, 200, and 250 meters) Results from 15 seeds for 200 m optimization. Other results were done for comparison – results similar

  3. simulation for TW FEL @ LCLS-II Summary: optimize for 200 m long second undulator

  4. simulation for TW FEL @ LCLS-II Summary: optimize for 150 m long second undulator

  5. simulation for TW FEL @ LCLS-II Summary: optimize for 250 m long second undulator

  6. Seed Power Dependence

  7. simulation for TW FEL @ LCLS-II Seed Seeded TW: Taper profile for 1 MW seed 13 keV FEL through a 1.2E-05 (FWHM) bandwidth The FEL centered @ 0.9547 Å

  8. Example: 13 keV TW FEL

  9. Summary Table Explore power as a function of fixed undulator length versus beam energy Optimize undulator period

  10. Outstanding Issues • Existing (308 meter) undulator hall design can fit 188 meters of undulator with present mirror arrangement • May be able to gain some additional space • Electron bunch: 4 kA, 0.3 mm, and 1.3 MeV slice DE/E • Simulations do not include contingency (typically 20%) • Further optimization of simulations may improve results, e.g. optimization of beta functions for 18 keV yielded 50% improvement but this was not performed at 8 or 13 keV • Comparison with results from HXRSS not great • Presumably further optimization of experiment will improve those results

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