Design of monochromatic X-ray imager with a pinhole and a logarithmic spiral Bragg mirror for Z-pinch diagnose

Monochromatic self-emission X-ray imaging is a powerful way to diagnose the imploding Z-pinch plasmas. Several approaches have been successfully developed to image the 0.1–1 keV continuous emission of a time evolving Z-pinch plasma, including the using of a filtered pinhole camera and a filtered pinhole camera combined with a grazing incidence reflection mirror or a planar multilayer mirror, but these techniques might be unfeasible when the instrument is keyed to image the 1–10 keV K-shell emission due to the inherent constraints such as limited mirror-filter match and/or large energy dispersion. In this paper, we proposed a novel monochromatic X-ray imaging approach that employs a pinhole camera and a logarithmic spiral Bragg mirror. The logarithmic spiral Bragg mirror is a non-dispersive monochromator that break the constraints meted in the planar mirror and thus can be used to image the K-shell emission. The geometrical imaging theory of this new instrument and the instrument design and evaluation are discussed.