title: Producing parallel x rays with a bent-crystal monochromator and an x-ray tube.
abstract: A bent Laue monochromator and a conventional x-ray tube were used to produce a fan beam that was parallel in the plane perpendicular to the plane of the fan. The x-ray fan beam was tunable in energy and had about 12% energy bandwidth at a slice height of 5 mm when tuned to 50 keV. The beam's energy was slightly coupled to the vertical position on the beam's height. The slice height could be varied from 1 to 10 mm. The flux at 50 keV was approximately 2x10(6) photons/mm2/s with a rotating anode tungsten x-ray tube operating at 120 kVp and 100 mA. The narrow energy bandwidth of the beam produced is advantageous over a conventional divergent polychromatic beam for all radiography applications, while the parallelism of the beam enhances its intensity by about threefold and offers some advantages for computed tomography.
authors.affiliation: National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973, USA. zhong@bnl.gov
authors.forename: Z
authors.initials: Z
authors.lastname: Zhong
authors.forename: F A
authors.initials: FA
authors.lastname: Dilmanian
authors.forename: T
authors.initials: T
authors.lastname: Bacarian
authors.forename: N
authors.initials: N
authors.lastname: Zhong
authors.forename: D
authors.initials: D
authors.lastname: Chapman
authors.forename: B
authors.initials: B
authors.lastname: Ren
authors.forename: X Y
authors.initials: XY
authors.lastname: Wu
authors.forename: H J
authors.initials: HJ
authors.lastname: Weinmann
mesh_terms: D055592:Biophysical Phenomena; D001703:Biophysics; D004867:Equipment Design; D008962:Models, Theoretical; D055095:Optics and Photonics / Q000295:instrumentation; D014057:Tomography, X-Ray Computed / Q000295:instrumentation* / Q000706:statistics & numerical data; D014965:X-Rays