title: Optimum design of a grazing-incidence flat-field spectrograph with a spherical varied-line-space grating.
abstract: A grazing-incidence spectrograph is designed by use of the flat-field image-focusing property of a spherical varied-line-space grating. Optimum grating parameters for mechanical ruling are selected by application of genetic algorithms. Two gratings, one for 2-5-nm and the other for 5-20-nm spectral regions, are designed, and their fabrication tolerances are analyzed.
authors.affiliation: Department of Mechanical Engineering, Tokyo Metropolitan University, 1-1 Minami-Oswa, Hachioji-shi, Tokyo 192-0397, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Harada
authors.forename: K
authors.initials: K
authors.lastname: Takahashi
authors.forename: H
authors.initials: H
authors.lastname: Sakuma
authors.forename: A
authors.initials: A
authors.lastname: Osyczka