Improved measurements of noise and resolution of x-ray framing cameras at 1–2 keV

Abstract

We describe x-ray framing cameras that were developed for experiments on the Nike laser system at the Naval Research Laboratory. These cameras have internal impedance matching to allow use of 50Ω pulsing systems from 100 ps to several nanoseconds, or for long pulse/dc operation. The cameras have been optimized for spatial resolution and low light scatter using aluminized phosphors. One of these cameras has been coupled to a charge coupled device camera and the total system was tested for resolution and image noise using both electrons and x rays. The spatial resolution was found to be well fitted to a Gaussian modulation transfer function with a value of 0.5 at 10 lp/mm. A detailed analysis of the noise in the images was performed for electrons and x rays. The noise in the images is determined by a detective quantum efficiency of approximately 10% for 1–2 keV x-ray photons.