SPATIAL-RESOLUTION OF GATED X-RAY PINHOLE CAMERAS

We have conducted an investigation of the spatial resolution of a new gated x-ray pinhole camera (FXI). The spatial resolution, or its Fouri er transform the modulation transfer function (MTF), is critical for q uantitative interpretation of recent hydrodynamic instability data tak en on the Nova laser. We have taken data corresponding to backlit stra ight edges, pinholes, and grids, both on the bench and in situ on Nova . For both the pinhole and edge data, the MTF at all wavelengths of in terest can be deduced from a single image. Grids are of more limited u sefulness, giving the value of the MTF only at the spatial period of t he grid. These different techniques for characterizing the MTF of gate d x-ray pinhole cameras will be discussed, with results specific to th e EXT presented. (C) 1997 American Institute of Physics.