The simplest type of a capillary optics is the X-ray guide, a cylindrically shaped monocapillary. It collimates the X-ray beam and limits the divergence angle at the monocapillary exit to the critical angle of total reflection. In comparison to a pinhole an X-ray guide enhances the intensity on the sample surface considerably. X-ray guides are manufactured with different capillary diameters and capillary lengths in accordance with their application. Additionally they can be equipped by aligned pinholes.
|Source – entrance distance f1 [mm]||> 10|
|Capillary diameter d1* [µm]||10 ... 1000|
|Length l** [mm]||94, 135, 165, 173, 191, 210, 230|
|Energy range [keV]||1 ... 30|
|Optimal source size [mm]||0.02 ... 1.0|
|Housing diameter dmax*** [mm]||7, 10, 16|
|Intensity gain||3 ... 10|