title: Focusing and collimation of x rays using microchannel plates: an experimental investigation.
abstract: Focusing and collimation of 8 keV x rays has been demonstrated using microchannel plate (MCP) blanks with cylindrical channels. The focusing effect arises from total external reflection of x rays at the interior surfaces of the channels of a MCP and has been described previously by the authors. Point to point focusing was observed with flat and curved MCPs, and collimation from a point source to a quasi-parallel beam was observed with a curved MCP. Intensity profiles at the image plane and at other planes behind a flat MCP were obtained for a 20 × 40 μm2 x-ray source, and agree well with theoretical predictions. The flux in a 40-μm-diameter collector in the image plane was compared with the flux in the same plane, but without a MCP. The relative gain in flux increases linearly with the source to MCP distance, as predicted. A maximum relative gain in flux of 18 ± 1 was observed for a source to detector distance of 50 cm.
authors.affiliation: School of Physics, The University of Melbourne, Parkville, Victoria 3052, Australia.
authors.forename: H N
authors.initials: HN
authors.lastname: Chapman
authors.forename: K A
authors.initials: KA
authors.lastname: Nugent
authors.forename: S W
authors.initials: SW
authors.lastname: Wilkins
authors.forename: T J
authors.initials: TJ
authors.lastname: Davis