title: A proposal for an X-ray free-electron laser oscillator with an energy-recovery linac.
abstract: We show that a free-electron laser oscillator generating x rays with wavelengths of about 1 A is feasible using ultralow emittance electron beams of a multi-GeV energy-recovery linac, combined with a low-loss crystal cavity. The device will produce x-ray pulses with 10{9} photons at a repetition rate of 1-100 MHz. The pulses are temporarily and transversely coherent, with a rms bandwidth of about 2 meV, and rms pulse length of about 1 ps.
authors.affiliation: Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: Kwang-Je
authors.initials: KJ
authors.lastname: Kim
authors.forename: Yuri
authors.initials: Y
authors.lastname: Shvyd'ko
authors.forename: Sven
authors.initials: S
authors.lastname: Reiche