Figure 5

Comparison between the spectra obtained from the signals acquired for the shot #38, without the Al filter, and shot #5 with the Al filter for the three thicknesses, according to the nominal tolerances. The vertical yellow line indicates the maximum proton energy (\({E}_{pM}\)) obtained during shot #38 and the magenta line corresponds to the energy where the ion contribution to that spectrum ends (namely \({E}_{pM}-\Delta {E}_{pM}\)), as described in the section “Estimation of the energy range for pure proton detection”.