We describe the recent emergence of attosecond science, assessing the present state of the
art and discussing several recent examples where attosecond electron dynamics has been …

Accelerator-based light sources such as storage rings and free-electron lasers use
relativistic electron beams to produce intense radiation over a wide spectral range for …

We propose to use the mechanism of an echo effect previously observed in hadron
accelerators for up-frequency conversion of density modulation in an electron beam. We …

Influence of a linear energy chirp in the electron beam on a self-amplified spontaneous
emission (SASE) Free Electron Laser (FEL) operation is studied analytically and numerically …

We report on the temporal and spatial stability of the first tunable femtosecond undulator
hard–x-ray source for ultrafast diffraction and absorption experiments. The 2.5–1 Å output …

Free-electron lasers producing ultrashort pulses with high peak power promise to extend
ultrafast non-linear spectroscopic techniques into the extreme-ultraviolet–X-ray regime. Key …

With the scientific successes of the soft X-ray FLASH facility in Germany and the recent
spectacular commissioning of the Linac Coherent Light Source at SLAC, free electron lasers …

A technique is proposed to generate attosecond pulse trains of radiation from a free-electron
laser amplifier. The optics-free technique synthesizes a comb of longitudinal modes by …

Attoscience is the study of physical processes that occur in less than a fraction of a cycle of
visible light, in times less than a quadrillionth of a second. The motion of electrons inside …

X-ray free-electron lasers (XFELs) are cutting-edge research tools that produce almost fully
coherent radiation with high power and short-pulse length with applications in multiple …