Fig. 1: Acceleration principle and experimental setup.
From: Unforeseen advantage of looser focusing in vacuum laser acceleration
Acceleration mechanism in two steps: a electron bunches (yellow) are extracted from a nanotip (blue) at t1 and accelerated via VLA around t2. Experimental setup: top (b) and side (c) view. The nanotip magazine positions the tips into the laser focus (laser in red). Electrons are diagnosed by scintillating screen detectors or a spectrometer (not shown). The laser polarization direction (along z) is perpendicular to the axis of the nanotip.
