title: A 30-cm objective grating for far-UV astronomy: theoretical study and laboratory tests.
abstract: We have performed theoretical determination and experimental calibrations of an objective grating designed for high resolution spectroscopy of astronomical faint sources in the EUV and far-UV wavelength ranges (500-1400 A). First through theoretical calculations we show the feasibility of the concept with an aspheric shape for the grating blank and determine its geometrical parameters. A grating of this large size has been manufactured and tested, associated with a photon counting detector, in a vacuum environment. Finally we demonstrate that a resolving power of 3 x 10(4), a total equivalent effective area of ~5-10 cm(2) can be achieved, together with a very low scattered light level (10(-4)-10(-5) of the peak value).
authors.forename: R
authors.initials: R
authors.lastname: Prangé
authors.forename: M
authors.initials: M
authors.lastname: Duban
authors.forename: A
authors.initials: A
authors.lastname: Vidal-Madjar
authors.forename: J
authors.initials: J
authors.lastname: Barnstedt
authors.forename: D
authors.initials: D
authors.lastname: Parisot
authors.forename: M
authors.initials: M
authors.lastname: Decaudin
authors.forename: J P
authors.initials: JP
authors.lastname: Crussaire
authors.forename: C
authors.initials: C
authors.lastname: Laurent
authors.forename: A
authors.initials: A
authors.lastname: Labèque
authors.forename: G
authors.initials: G
authors.lastname: Ancourt
authors.forename: J
authors.initials: J
authors.lastname: Flamand
authors.forename: M
authors.initials: M
authors.lastname: Grewing
authors.forename: R
authors.initials: R
authors.lastname: Hoekstra
authors.forename: A
authors.initials: A
authors.lastname: Thévenon
authors.forename: G
authors.initials: G
authors.lastname: Bargot
authors.forename: M
authors.initials: M
authors.lastname: Barthélémy
authors.forename: F
authors.initials: F
authors.lastname: Canovas
authors.forename: J
authors.initials: J
authors.lastname: Charra
authors.forename: C
authors.initials: C
authors.lastname: Hallier
authors.forename: H
authors.initials: H
authors.lastname: Lagardère
authors.forename: G
authors.initials: G
authors.lastname: Levanti
authors.forename: G
authors.initials: G
authors.lastname: Michaud
authors.forename: H
authors.initials: H
authors.lastname: Poncet