Figure 1
Image of a monochromatic beam obtained from a flat Si(111) crystal diffracting, in symmetrical Bragg setting, in the horizontal plane, at 145 m from the source (E = 20 keV). (a) Lines, due to the beryllium windows located at 26 and 135 m from the source, and a wavy structure, associated with the carbon filters located at 25 m with respect to the source, are clearly visible. (b) The same image after removing the second beryllium window and the carbon filters. |