1 / 21

Longitudinal Impedance Budget from LINAC to SASE2

Longitudinal Impedance Budget from LINAC to SASE2. Igor Zagorodnov Beam Dynamics Group Meeting 13.11.06. SASE2. SASE1. (W.Decking). Wakefield sources Resistance of the pipe (r=25mm, L=456m, Aluminium) Collimators (r=2mm, L=50cm, 4 items, TIMETAL 6-4 )

delling-ull
Download Presentation

Longitudinal Impedance Budget from LINAC to SASE2

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. Longitudinal Impedance Budget from LINAC to SASE2 Igor Zagorodnov Beam Dynamics Group Meeting 13.11.06

  2. SASE2 SASE1 (W.Decking)

  3. Wakefield sources • Resistance of the pipe (r=25mm, L=456m, Aluminium) • Collimators (r=2mm, L=50cm, 4 items, TIMETAL 6-4 ) • Kickers (r=10mm, L=10m, 3 items, R/L=10W/m )

  4. Collimator (geometrical wake) Diffractive regime: the geometrical wake repeats the bunch shape

  5. Collimator (resistive wake) http://www.timet.com/timetal6-4frame.html TIMETAL 6-4 alloy (Titanium) (E.Schutz MVA) M.Dohlus. TESLA 2001-26, 2001 K.L.F.Bane, G.V.Stupakov, SLAC-PUB-10707, 2004

  6. Collimator TIMETAL 6-4 alloy (Titanium) bunch resistive total

  7. (T.Wohlenberg) Pipe (resistive+oxid layer+roughness) Aluminium bunch resistive

  8. Kicker (geometrical wake) (T.Wohlenberg)

  9. Kicker (resistive wake) (T.Wohlenberg)

  10. Kicker bunch resistive total

  11. TOTAL (LINAC to SASE2) pipe bunch collimators kickers

  12. bunch after LINAC before SASE2 Energy spread due to wakefields between LINAC and SASE 2 bunch

  13. Energy losses between LINAC and SASE2 vs. pipe radius R Spread With oxid layer and roughness Geometrical+resistive Peak Loss

  14. TOTAL (SASE2) pipe in intersection bunch absorbers undulator pipe (T.Wohlenberg) * M. Dohlus et al, TESLA-FEL 2005-10

  15. Spread total collimators Energy spread between LINAC and SASE2 vs. pipe radius R (normalized to the spread in SASE2)

  16. Spread total collimators Conclusion Impact on FEL performance? (spectrum from SASE simulations?)

  17. flat round Appendix A. Kick factors of flat and round collimators are equal

  18. flat round Appendix A. Kick factors of flat and round collimators are equal =

  19. flat round Appendix A. Kick factors of flat and round collimators are equal = = =0.5 Kick of the flat collimator is equal to the kick of the round one

  20. Appendix B. XFEL collimator vs. cryomodule

  21. Appendix B. XFEL collimator vs. cryomodule For the bunch with sigma=25mkm the kick from the collimator with apperture b2=2mm is equal to the kick of ~700 cryomoduoles Emmitance growth?

More Related