The necessity to take into consideration the angular size of the x-ray beam and its influence on the parameters of the reflected x-ray beam for ray tracing analysis will be shown.
An approach to using multilayer optics for SAXS is discussed. The approach consists of employing a two-dimensional multilayer focusing optic to monochromatize and intensify the x-ray beam, and a pinhole system to further shape the beam. Depending on the sample scattering power, different pinhole systems can be used. With a two-pinhole system, high flux can be achieved but with nonblocked parasitic scattering from the pinholes and scattering from multilayer reflectors.With a three-pinhole system, parasitic scattering and scattering from multilayer are completely shielded beyond certain angular range for weak scattering samples. Using raytracing method, the performances of the proposed systems are compared to the most commonly used graphite-pinhole system and found to provide a factor 10 more flux for similar resolution and background requirements.
X-ray diffraction systems based on a microfocusing X-ray source and multilayer
side-by-side optics are suitable for X-ray diffraction studies in a variety of fields, such as protein crystallography, due to their compactness and low cost in maintenance. However, new problems can occur, such as intensity instability induced by source position drifting. Various investigations for the reasons and the consequences of the instability are presented in this paper. Feasible solutions and suggestions are given to obtain more stable system performance.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.