A proton shadow camera using CR-39 track detectors

Abstract

We have developed a capability for imaging proton sources of moderate energy (6 MeV), with moderate spatial resolution (≅ 9 μm), as a diagnostic for laser fusion research. Our technique involves the use of Fresnel zone plate coded imaging coupled with nuclear track detectors (CR-39). We report on a series of test experiments in which a zone plate shadow camera successfully produced images of a proton source distribution. The zone plate shadow patterns were optically reconstructed in higher order producing diffraction-limited point response images with FWHM values of ≅ 9 μm for a 6 MeV proton source.