Title: Laser electron acceleration on curved surfaces,
Abstract: Electron acceleration by relativistically intense laser beam propagating
along a curved surface allows to split softly the accelerated electron bunch
and the laser beam. The presence of a curved surface allows to switch an
adiabatic invariant of electrons in the wave instantly leaving the gained
energy to the particles. The efficient acceleration is provided by the presence
of strong transient quasistationary fields in the interaction region and a long
efficient acceleration length. The curvature of the surface allows to select
the accelerated particles and provides their narrow angular distribution. The
mechanism at work is explicitly demonstrated in theoretical models and
experiments.