Abstract:
Hard x-ray EnergyRecovery Linacs (ERLs) operate with high-brightness electron beams, matching the requirements for x-ray FELs in terms of emittance and energy spread. We have analyzed in how far it is feasible to include xray FELs in ERL facilities. x-ray FEL oscillators require comparatively low peak currents and are therefore good candidates for FEL sources in ERLs. However, high-gain FELs do not seem out of reach when bunch-compression schemes for higher peak currents are utilized. Using the proposed Cornell ERL as an example, different FEL concepts are discussed and their suitability as x-ray sources are analyzed.