Fig. 1: Schematic of the experimental setup and laser focal spot profile measurement.
From: A multi-MeV alpha particle source via proton-boron fusion driven by a 10-GW tabletop laser
a Experimental setup inside the vacuum chamber: the laser pulse is incident on the CH-BN target (containing protons and Boron) at 45° through a viewport and is focused by an aspheric lens located inside the chamber. The lens is protected from debris by a transparent protective glass. Two CR39 stripes with plain and filtered regions are aligned in front of the target, leaving the equatorial plane unobstructed for the FC (Faraday Cup) placed at the target normal. b Post-processed photo of the spatial-intensity profile of the laser focal spot measured on target. The FWHM (full width at half maximum) size of the focal spot along with the laser energy and mean intensity encircled inside it are stated in the figure.
