Reconstruction of 2D x-ray radiographs at the National Ignition Facility using pinhole tomography (invited)

Rev Sci Instrum. 2014 Nov;85(11):11E503. doi: 10.1063/1.4890395.

Abstract

Two-dimensional radiographs of imploding fusion capsules are obtained at the National Ignition Facility by projection through a pinhole array onto a time-gated framing camera. Parallax among images in the image array makes it possible to distinguish contributions from the capsule and from the backlighter, permitting correction of backlighter non-uniformities within the capsule radiograph. Furthermore, precise determination of the imaging system geometry and implosion velocity enables combination of multiple images to reduce signal-to-noise and discover new capsule features.