title: Wide band focusing x-ray spectrograph with spatial resolution.
abstract: A new, wide spectral bandwidth x-ray spectrograph, the wide-bandwidth focusing spectrograph with spatial resolution (WB-FSSR), based on spherically bent mica crystals, is described. The wide bandwidth is achieved by combining three crystals to form a large aperture dispersive element. Since the WB-FSSR covers a wide spectral band, it is very convenient for application as a routine diagnostic tool in experiments in which the desired spectral coverage is different from one test to the next. The WB-FSSR has been tested in imploding wire-array experiments on a 1 MA pulsed power machine, and x-ray spectra were recorded in the 1-20 A spectral band using different orders of mica crystal reflection. Using a two mirror-symmetrically placed WB-FSSR configuration, it was also possible to distinguish between a real spectral shift and a shift of recorded spectral lines caused by the spatial distribution of the radiating plasma. A spectral resolution of about 2000 was demonstrated and a spatial resolution of approximately 100 microm was achieved in the spectral band of 5-10 A in second order of mica reflection. A simple method of numerical analysis of spectrograph capability is proposed.
authors.affiliation: Cornell University, Ithaca, NY 14853, USA.
authors.forename: S A
authors.initials: SA
authors.lastname: Pikuz
authors.forename: J D
authors.initials: JD
authors.lastname: Douglass
authors.forename: T A
authors.initials: TA
authors.lastname: Shelkovenko
authors.forename: D B
authors.initials: DB
authors.lastname: Sinars
authors.forename: D A
authors.initials: DA
authors.lastname: Hammer