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GENESIS simulations with Wakefields for XFEL

GENESIS simulations with Wakefields for XFEL. Igor Zagorodnov BDGM, DESY 26.09.05. SASE 2 parameters. Parameters XFEL theory. Parameters XFEL theory. Gain parameter. Efficiency parameter. Diffraction parameter. Effective power of the input signal. Gain length *. Optimal beta-function.

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GENESIS simulations with Wakefields for XFEL

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  1. GENESIS simulations with Wakefields for XFEL Igor Zagorodnov BDGM, DESY 26.09.05

  2. SASE 2 parameters

  3. Parameters XFEL theory

  4. Parameters XFEL theory Gain parameter Efficiency parameter Diffraction parameter Effective power of the input signal

  5. Gain length* Optimal beta-function Saturation length * E.L.Saldin et al./Optics Communications 235 (2004) 415-420

  6. Genesis steady state simulation

  7. ELOSS= = - 48keV/m head tail tail head

  8. Genesis steady state simulation Scan with ELOSS = - 48keV/m

  9. Power no wake (amplifier) no wake (SASE) with wake (amplifier) with wake (SASE)

  10. Genesis time dependent simulation SASE model Amplifier model

  11. Taper optimization (steady state) Scan with ELOSS = - 100keV/m

  12. Genesis time dependent simulation SASE model

  13. Power (Gaussian bunch) wake+taper with wake no wake

  14. Shape 0 „Real“ shapes from Martin Dohlus http://www.desy.de/~dohlus/2005.09.xfel_wakes head tail Shape 3 tail head tail head

  15. Geometric wake? Longitudinal wake for the case of the elliptical pipe (3.8mm) The wake repeats the bunch shape

  16. Genesis time dependent simulation (SASE) Shape 3 Gaussian

  17. Power

  18. Genesis time dependent simulation (SASE) Shape 0 Gaussian

  19. Power in a.u. Gaussian Shape 0 Shape 3

  20. Gaussian Shape 0 Shape 3 Taper:

  21. Power Gaussian Shape 0 Shape 3

  22. Conclusions 1. The wake field reduces the power at L=250 m by factor 2.5 for the Gaussian bunch and up to factor 7 by the “real” shape 2. The linear taper allows to avoid the degradation and to increase the power by factor 2 for the Gaussian bunch 3. The same taper allows to avoid the degradation for other shapes too Acknowledgements to Evgeny Schneidmiller and Martin Dohlus for the help

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