Neutron penumbral imaging at Gekko XII (abstract)

Abstract
14 MeV DT neutrons emitted from a laser‐imploded target have been imaged by using a penumbral aperture camera. This system consists of a 6‐cm‐thick tungsten toroidal aperture, an array of plastic scintillators, an optical fiber coupled two‐stage image intensifier, and a cooled CCD camera. A burn region has been observed with a spatial resolution of ∼35 μm at a neutron yield of 5×1011. The spatial resolution was determined by a pixel resolution, the accuracy of the aperture fabrication, the alignment accuracy of the aperture, the signal‐to‐noise ratio of an encoded image, and the statistical fluctuation in detecting neutrons.