title: Large-aperture focusing of high-energy x rays with a rolled polyimide film.
abstract: We describe a point-focusing x-ray lens made of a rolled polyimide film with etched prisms. The resulting lens is a cylinder with a large number of prisms forming an internal conic structure. The method allows for the manufacturing of lenses with large apertures and short focal lengths, for energies up to at least 100 keV. In order to evaluate the concept, we have hand-rolled a few lenses and evaluated them at a synchrotron source. The measured performance of the prototype is promising, and deviations from the theoretical limits are quantitatively explained.
authors.affiliation: Department of Physics, Royal Institute of Technology (KTH), Stockholm, Sweden. nillius@mi.physics.kth.se
authors.forename: Peter
authors.initials: P
authors.lastname: Nillius
authors.forename: Staffan
authors.initials: S
authors.lastname: Karlsson
authors.forename: Björn
authors.initials: B
authors.lastname: Cederström
authors.forename: Erik
authors.initials: E
authors.lastname: Fredenberg
authors.forename: Mats
authors.initials: M
authors.lastname: Danielsson