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(Color online) Energy spectra of proton beams with high contrast (10−8) and low contrast (10−6) laser pulses for the tight focus on 50 nm Al foils.
(Color online) (a) Energy spectra of proton beams for 50 nm Al foils vs. laser intensities (focal offsets) for low contrast (10−6) laser pulses. Laser energy is kept as constant. (b) The E cutoff of proton beams vs. varied focal intensities for 50 nm (black star) and 2 μm (red dot) foils.
(Color online) (a) Schematics of the ion beam footprint imaging system, which measures the spatial distribution of the lower part of the ion beam. The detector is covered by a set of filters with different thickness, which provides a rough energy resolution. (b) The spatial distributions of the proton beams from 50 nm foils for varied laser intensities. All the images are under the same color scale. The black gap shown in each image is due to the proton fluence reduction by the filters.
(Color online) The proton dose of the whole beam under varied laser intensities.
(Color online) (a) Experimental energy spectra of hot electrons in the forward direction at the laser intensities of 4.8 × 1019 W/cm2 (black line) and 1.6 × 1017 W/cm2 (red line). (b) Simulated energy spectra of hot electrons when the target is at the best focal position (black square) and 27λ away from the best focal position (red star) at t = 30T0.
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