Fig. 1. The track profiles in (a) the non-overetched case and (b) the overetched case for perpendicular incident particles.

Fig. 2. The track profiles for oblique incident particles.

Fig. 3. The measured and calculated energy responses of CR39 to proton, deuteron, triton and alpha.

Fig. 4. (a) The schematic setup of the D–D primary proton spectrometer at the SG-III prototype facility and (b) the measured proton spectra in the cool gas target (solid histogram) and the cryogenic target (dashed histogram) experiments with Gaussian fitting lines (blue lines).

Fig. 5. (a) The schematic diagram of the SRF proton spectrometer and (b) the simulated proton energy response matrix.

Fig. 6. The measured secondary proton spectra in the shot with a target diameter of .

Fig. 7. (a) The alignment of the Si-WRF spectrometer array at the SG-III facility (b) and a schematic illustration of a single WRF spectrometer^[11].

Fig. 8. (a) The energy response to 9 and 15 MeV mono-energetic protons and (b) the energy response matrix in the range of 4–19 MeV.

Fig. 9. (a) Comparisons of the unfolded spectra and the simulation input spectra in the cases of D–³He primary proton and (b) D–D secondary proton.

Fig. 10. The unfolded energy spectra under different incident proton counts in the cases of (a) D–³He primary protons and (b) D–D secondary protons.