An eye examination ?
This Egyptian scribe seems to undergo an examination of ophthalmology. His eye is positioned opposite to the exit window of the AGLAE beam. The horizontal tube is the beam one; the other two are used for X-rays detection. A beam extraction in air through an ultra-thin window of 0.1-micron made of silicon nitride Si3N4, a material of great strength, allows working at atmospheric pressure. One obtains at a beam diameter of about 2 microns by placing the object at 3 mm from the window. A flow of helium gas over the area analyzed improves the quality of measurements by reducing the air absorption of the beam and of the X-ray induced.