Attosecond x-ray pulses produced by ultra short transverse slicing via laser electron beam interaction

We propose a method of generation of similar to 115 attosecond x-ray pulses in a free electron laser (FEL) by means of producing ultra-fast angular modulation of the electron trajectories prior to entering the FEL. For this modulation, we employ a few-cycle laser pulse in a higher-order Gaussian mode and with carrier-envelope phase stabilization.