clic and xfel study group@sinap

clic and xfel study group@sinapMeng Zhang, Chao Feng, Qiang GuPreliminary work on the XFELRecent progressFEL parameters1D tracking using litrackFuture plans

FEL parameters the baselineParametersValueUnitWavelength0.07nmEnergy6.0GeVNormalized emittance0.4mm.mradEnergy spread (sliced)0.01%Peak current3kAPierce parameter~2*10-4Peak power4GWPeak brightness>1*10323D gain length longer pulse, coherence along the pulseTransverse: emittancePowerSingle shortAverage powerTiming between FEL and user instrumentationsWavelengthShortest wavelengthTunabilityKey requirements on the XFELOperating schemeLongitudinal coherenceHard X-ray: SASE(incoherence), pSASE, self-seedingSoft X-ray: pSASE, self-seeding, seeded scheme (EEHG, HGHG, cooled-HGHG) and their cascaded combinationsTransverse coherence: OK!Power~E-beam power * pierce parameterStabilityWavelengthE-beam energy, the field and period of the undulator Tunability of the Hard X-ray and Soft X-ray beamlineKey requirements on the e-beamEmittanceTransverseInitial emittance from the sourceConservationLongitudinalLow uncorrelated energy spread < pierce parameterStabilitypeak currentEnergy jitter < pierce parameterTiming jitter between the seeding laser and e-beam (important for seeded schemePowerEnergy, current (charge and bunch length)FlexibilityBunch length: long bunch length -> high order energy chirp correction; short bunch length -> energy chirp compensationCurrent: low current -> low pierce parameter; high current -> energy chirp compensation, wakefield