Grazing incidence x-ray optics for x-ray astronomical applications
are used outside the earth's atmosphere. These devices require a
large collection aperture and the imaging of an x-ray source that is essentially
placed at infinity. The ideal testing system for these optical elements
has to approximate that encountered under working conditions;
however, the testing of these optical elements is notoriously difficult with
conventional x-ray generators. Synchrotron radiation (SR) sources are
sufficiently brilliant to produce a nearly perfect parallel beam over a large
area while still retaining a flux considerably higher than that available
from conventional x-ray generators. A facility designed for the testing of
x-ray optics, particularly in connection with x-ray telescopes, is described.
It is proposed that this facility will be accommodated at the Synchrotron
Radiation Source at the Daresbury Laboratory in the United Kingdom.