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Both 1.3GHz and 3th harmonic φ 39 = 3* φ 13

Timing and Synchronisation for the X-Ray FEL Project V. Ayvazyan, A. Brandt, H. Weddig, H. Schlarb, S. Simrock, A. Winter, (DESY) C. J. Bocchetta, M. Danailov, M. Ferianis (Sincrotrone Trieste). Sensitivity of bunch length to phase errors. Sensitivity of beam timing to phase errors.

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Both 1.3GHz and 3th harmonic φ 39 = 3* φ 13

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  1. Timing and Synchronisation for the X-Ray FEL ProjectV. Ayvazyan, A. Brandt, H. Weddig, H. Schlarb, S. Simrock, A. Winter, (DESY)C. J. Bocchetta, M. Danailov, M. Ferianis (Sincrotrone Trieste) Sensitivity of bunch length to phase errors Sensitivity of beam timing to phase errors Option: Side Band Seeding: Only 1.3GHz booster = φ13 Only 3th harmonic φ39 = 3*φ13 • Few cycle laser pulse produce 300asec X-Ray pulse (1) • Intrinsical time stable for pump-probe exp. with asec stability (same seed and pump laser) φ13 View cycle laser Carrier envelope: Stabilizing the frequency off-set f0 of the comp allows to determine laser phase (cos/sin -like) Both 1.3GHz and 3th harmonic φ39 = 3*φ13 Both 1.3GHz and 3th harmonic φ39 = - 3*φ13 e- beam I/Ipeak>90% Desired time jitter (20fs rms) between e- beam and laser 99% within 10% peak current deviation • Challenges: • reliable few cycle seed laser with asec stability • laser beam transport to experimental side (10nm@500m) • time jitter between e-beam and laser, desired 20fs rms Synchronization scheme for the XFEL High precision energy measurement Desired resolution dE/E ~ 5e-5 Compact beam phase monitors Desired resolution dt ~ 10 fs FWHM • Path length stabilized fiber • Required: 10 fs @ 3.5 km • Desired: ~ 1 fs @ 3.5 km • Round trip time 35μs • impact on phase noise for MLO and LO! Beam based intra-train feedback for amplitude and phase of the booster section requires timing and energy, partially energy spread and bunch length information: to adjusted (A13, φ13, A39, φ39,) LLRF • Local RF distribution for Booster (4 modules) • VCO (1.3 GHz) synchronized to MLO < 10fs FWHM • Temperature stabilized cables from field probes to VCO • High precision amplitude and phase detectors (how) Scheme of LLRF error budged Digital control of cavity regulation Presently achieved SSC regulations • References: • Saldin et al., Terawatt-Scale Sub-10-fs Laser Technology DESY 04-013

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