Abstract
A very reliable and easily adjustable x-ray parabolic collimator with uniform intensity distribution in its output cross section is designed using the technology of depth-graded multilayer mirrors. The W/C multilayer mirror structure was specially designed so as to compensate for the decrease in output intensity at lower grazing angles. The advantages of depth-graded multilayer mirrors with respect to laterally graded ones are inexpensive and versatile technology, the absence of any need of precise axial adjustment along the parabolic profile, and the possibility of creating any desired reflection curve shape. With a focal length of 1015 mm and a source projection of 0.1 mm, the total angular divergence of the output beam was measured to be 25 angular seconds at Cu Kα radiation, i.e., only 5 arcsec larger than the theoretical limit. The total output flux at both the Cu Kα1 and Cu Kα2 lines is a factor of 50 larger than that delivered by a conventional Si(111) monochromator.
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