Fig. 2: Spatial profile and spectrum of accelerated protons. | Nature Communications

Fig. 2: Spatial profile and spectrum of accelerated protons.

From: Laser-driven proton acceleration beyond 100 MeV by radiation pressure and Coulomb repulsion in a conduction-restricted plasma

Fig. 2

a–c Raw data of the first (Bragg peak of 10-MeV protons) RCF using 100-nm-thick foil targets: planar (a), D = 80 μm (b), and D = 30 μm (c). D is the transverse width of a foil, and 0° is the laser propagation direction. d–f Signals of protons with an energy around 110 MeV measured by RCF, radioactivation, and CR-39, respectively, corresponding to the layer numbers 55, 53 and 56 in Supplementary Table 1. A D = 30 μm foil was utilized, and the electron signals in the RCF were negligible in this laser shot. g Unfolded proton spectra of the three targets obtained from the RCF measurement. For D = 30 μm, the results from radioactivation and CR-39 are also shown together. Both the front and rear surfaces of the last CR-39 plate were analysed to deduce the spectral intensities at approximately 110 MeV. The shaded regions indicate the uncertainties induced from the calibrations of RCF and imaging plate (IP).

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