title: Imaging characteristics of a conical primary, aspheric secondary x-ray telescope.
abstract: The imaging effectiveness of an x-ray telescope consisting of a simple conical primary reflector and an aspheric secondary reflector is compared with a paraboloidal primary, hyperboloidal secondary of the same dimensions (Wolter type II). The rms spot size for the Wolter type II is considerably smaller being 1/28 as large as that of the cone-asphere for incident collimated light 1 min off the optical axis and 1/6 as large for incident light 12 min off the optical axis for a typical configuration. The cone-asphere spot size, on the other hand, is one half as large as that for a hyperboloidal primary, asphere secondary telescope of the same dimensions.
authors.affiliation: University of Georgia, Department of Physics & Astronomy, Athens, Georgia 30602, USA.
authors.forename: D G
authors.initials: DG
authors.lastname: Burkhard
authors.forename: D L
authors.initials: DL
authors.lastname: Shealy
authors.forename: G L
authors.initials: GL
authors.lastname: Strobel