(a) Scheme of the experimental setup. IP is the image plate with 20 cm height and 15 (first), 12.5 (second), and 12.5 cm (third) length. (b) Contrast ratio of the incident laser pulse measured by a third-order autocorrelation device. (c) Laser focus spot.
Fast electron emission distribution recorded on IPs generated by (a) grating targets and (b) planar targets. The vertical lines represent the angles for target surface, laser specular, and target normal directions from left to right. (c) Angular distribution curves of fast electrons in the incident plane. The dotted lines, as those in (a) and (b), are, respectively, the angles of the target surface, laser specular, and target normal directions from left to right. Laser beam is labeled with the arrow. (d) The counts on IP of the surface accelerated fast electrons and the total fast electrons emitted toward the front side of target. Nos. 1 and 2 are the shots for planar target and Nos. 3 and 4 are the shots for grating target.
[(a) and (b)] The spatial distributions of the initial electron density, [(c) and (d)] the longitudinal static electric field , and [(e) and (f)] the static magnetic field cycle-averaged within . (a), (c), and (d) are for the planar target; (b), (d), and (f) are for the grating target.
The spatial distributions of fast electrons outside the target at . (a) Planar target and (b) grating target. The center of the incident laser beams is labeled with arrow.
[(a) and (b)] The spatial distributions of longitudinal electric field and [(c) and (d)] transverse electric field at . (a) and (c) are for the planar target; (b) and (d) are for the grating target.
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