Design

The optical design of BEaTriX encompasses an X-ray microfocus source with a Titanium anode, placed in the focus of a paraboloidal mirror, a monochromation stage with symmetrically-cut crystals, and an expansion stage where the beam is expanded by an asymmetrically-cut crystal to a 170 x 60 mm size. The beam is so collected by the MMs under test and focused on a CCD camera placed at a 12 m distance. The optical components are moved and aligned by means of precise vacuum motors.
All the system is enclosed in a vacuum tank reaching 10^-6 mbar, divided into several compartments, separated by gate valves. The vacuum is reached by a system of scroll pumps and turbo-molecular pumps. Each compartment can be evacuated and vented separately in order to minimize the time required for the MM mounting and removal. All the system is built on an L-shaped massive block of concrete on top of damping polymer pads in order to isolate the system from ground vibrations.