Characterization of ADP crystals for soft x-ray optics of the Beam Expander Testing X-ray facility (BEaTriX)

A new type of x-ray facility, the Beam Expander Testing x-ray facility (BEaTriX), has been designed and is now under construction at INAF– Osservatorio Astronomico di Brera (Merate, Italy) to perform the acceptance tests of the silicon pore optics modules of the ATHENA X-ray telescope. Crystals of high perfection and large dimensions are needed in order to obtain a wide beam (20 × 6 cm2) with an X-ray divergence