title: X-ray grating spectrometer for opacity measurements in the 50 eV to 250 eV spectral range at the LULI 2000 laser facility.
abstract: An x-ray grating spectrometer was built in order to measure opacities in the 50 eV to 250 eV spectral range with an average spectral resolution <E∕δE> ∼ 50. It has been used at the LULI-2000 laser facility at École Polytechnique (France) to measure the Δn = 0, n = 3 transitions of several elements with neighboring atomic number: Cr, Fe, Ni, and Cu in the same experimental conditions. Hence a spectrometer with a wide spectral range is required. This spectrometer features one line of sight looking through a heated sample at backlighter emission. It is outfitted with one toroidal condensing mirror and several flat mirrors cutting off higher energy photons. The spectral dispersion is obtained with a flatfield grating. Detection consists of a streak camera sensitive to soft x-ray radiation. Some experimental results showing the performance of this spectrometer are presented.
authors.affiliation: CEA, DAM, DIF, 91297 Arpajon, France. charles.reverdin@cea.fr
authors.forename: Charles
authors.initials: C
authors.lastname: Reverdin
authors.forename: Frédéric
authors.initials: F
authors.lastname: Thais
authors.forename: Guillaume
authors.initials: G
authors.lastname: Loisel
authors.forename: M
authors.initials: M
authors.lastname: Busquet
authors.forename: S
authors.initials: S
authors.lastname: Bastiani-Ceccotti
authors.forename: T
authors.initials: T
authors.lastname: Blenski
authors.forename: T
authors.initials: T
authors.lastname: Caillaud
authors.forename: J E
authors.initials: JE
authors.lastname: Ducret
authors.forename: W
authors.initials: W
authors.lastname: Foelsner
authors.forename: D
authors.initials: D
authors.lastname: Gilles
authors.forename: F
authors.initials: F
authors.lastname: Gilleron
authors.forename: J C
authors.initials: JC
authors.lastname: Pain
authors.forename: M
authors.initials: M
authors.lastname: Poirier
authors.forename: F
authors.initials: F
authors.lastname: Serres
authors.forename: V
authors.initials: V
authors.lastname: Silvert
authors.forename: G
authors.initials: G
authors.lastname: Soullie
authors.forename: S
authors.initials: S
authors.lastname: Turck-Chieze
authors.forename: B
authors.initials: B
authors.lastname: Villette