title: OZSPEC-2: an improved broadband high-resolution elliptical crystal x-ray spectrometer for high-energy density physics experiments (invited).
abstract: A novel time, space, and energy-resolved x-ray spectrometer has been developed which produces, in a single snapshot, a broadband and relatively calibrated spectrum of the x-ray emission from a high-energy density laboratory plasma. The opacity zipper spectrometer (OZSPEC-1) records a nearly continuous spectrum for x-ray energies from 240 to 5800 eV in a single shot. The second-generation OZSPEC-2, detailed in this work, records fully continuous spectra on a single shot from any two of these three bands: 270-650, 660-1580, and 1960-4720 eV. These instruments thus record thermal and line radiation from a wide range of plasmas. These instruments' single-shot bandwidth is unmatched in a time-gated spectrometer; conversely, other broadband instruments are either time-integrated (using crystals or gratings), lack spectral resolution (diode arrays), or cover a lower energy band (gratings). The OZSPECs are based on the zipper detector, a large-format (100x35 mm) gated microchannel plate detector, with spectra dispersed along the 100 mm dimension. OZSPEC-1 and -2 both use elliptically bent crystals of OHM, RAP, and/or PET. Individual spectra are gated in 100 ps. OZSPEC-2 provides one-dimensional spatial imaging with 30-50 microm resolution over a 1500 microm field of view at the source. The elliptical crystal design yields broad spectral coverage with resolution E/DeltaE>500, strong rejection of hard x-ray backgrounds, and negligible source broadening for extended sources. Near-term applications include plasma opacity measurements, detailed spectra of inertial fusion Hohlraums, and laboratory astrophysics experiments.
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Ave., Livermore, California 94550, USA. heeter1@llnl.gov
authors.forename: R F
authors.initials: RF
authors.lastname: Heeter
authors.forename: S G
authors.initials: SG
authors.lastname: Anderson
authors.forename: R
authors.initials: R
authors.lastname: Booth
authors.forename: G V
authors.initials: GV
authors.lastname: Brown
authors.forename: J
authors.initials: J
authors.lastname: Emig
authors.forename: S
authors.initials: S
authors.lastname: Fulkerson
authors.forename: T
authors.initials: T
authors.lastname: McCarville
authors.forename: D
authors.initials: D
authors.lastname: Norman
authors.forename: M B
authors.initials: MB
authors.lastname: Schneider
authors.forename: B K F
authors.initials: BK
authors.lastname: Young