Sketch of experimental setup.
Energy spectra of escaped electron and proton beams obtained simultaneously using the Thomson parabola ion spectrometer and the magnetic electron spectrometer at different laser intensities. (a) Electron energy spectra shown with open rectangles and black dots are obtained at the and , which can be fitted with the slope temperatures of and , respectively, for Boltzmann distributions. The dashed line shows the detection limit. (b) Proton energy spectra obtained simultaneously with the escaped electron energy spectra of (a). The data points of open rectangles and black dots correspond to the data points at and , respectively, of (a). The proton energy spectra have the spectral cutoffs at maximum energies of and , respectively. The black solid line shows the detection limit.
Correlation between escaped electron temperature and proton maximum energy . Data points (rectangles) are fitted with the interpolation curve of .
(a) Proton beam image on RCF with a periodic modulation of the signal intensities affected by the grating structures on the target rear surface. (b) Proton dose profile along the line shown in proton image of (a) and periodic density modulation filtered from the proton dose profile. The peak number of the periodic density peaks is 25.
Correlation of escaped electron slope temperature with proton source size and areal density at the maximum proton energy obtained for a laser pulse energy 100 J.
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