Mono-Capillary Optics

As Kumakhov discovered, X-Rays are very efficiently reflected off glass surfaces when the angle of incidence is low. By producing carefully shaped glass optics it is thus possible to use this total external reflection to focus, collimate and steer X-Ray beams.

The solid angle from the X-Ray source to the capillary is relatively large, which means that coupling between the two is efficient. As a result, very high intensities of X-Rays can be channeled into the capillary, and since reflection itself is very efficient, capillaries can be used to generate high intensity micro-beams with diameters as small as 10 µm. The HORIBA X-ray guide tube (XGT) is an example of the successful use of mono-capillaries, and indeed is unique in allowing 10 µm spatial resolution on a bench top system.

In addition to their intensity, beams generated with mono-capillary glass optics display near perfect collimation, making them ideally suited for micro-XRF analysis.

Mono-Capillary Optics