Study of X-ray imaging with toroidally bent crystal.

We developed a focusing imager with a toroidally bent crystal imager. The imager can be used in X-ray imaging of laser fusion experiments. This article discusses the focusing properties of toroidally bent crystal in Bragg geometry. Simulations of spatial resolution for toroidally bent crystals with different conditions including source size and detector position were done using the ray-tracing method. The applicable conditions for optimized two-dimensional (2D) imaging of X-ray source are proposed. Toroidally bent crystal of mica with curvature radius 290 mm in the meridional plane and 190 mm in the sagittal plane is used as imaging element in the experiments. The high-quality visible 2D X-ray image was obtained with the imaging plate due to the high collection efficiency of the bent crystal imaging system. It is demonstrated that the toroidally bent mica crystal could be used in X-ray imaging. By analyzing the image information of the sagittal direction, we find out that the toroidal crystal imager has spatial resolution about 34 μm. © 2012 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 22, 226-232, 2012 [ABSTRACT FROM AUTHOR]