1 / 10

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

roch
Télécharger la présentation

Undulator length for TW FEL

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. 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

More Related