title: Development of a high resolution x-ray spectrometer for the National Ignition Facility (NIF).
abstract: A high resolution (E/ΔE = 1200-1800) Bragg crystal x-ray spectrometer is being developed to measure plasma parameters in National Ignition Facility experiments. The instrument will be a diagnostic instrument manipulator positioned cassette designed mainly to infer electron density in compressed capsules from Stark broadening of the helium-β (1s2-1s3p) lines of krypton and electron temperature from the relative intensities of dielectronic satellites. Two conically shaped crystals will diffract and focus (1) the Kr Heβ complex and (2) the Heα (1s2-1s2p) and Lyα (1s-2p) complexes onto a streak camera photocathode for time resolved measurement, and a third cylindrical or conical crystal will focus the full Heα to Heβ spectral range onto an image plate to provide a time integrated calibration spectrum. Calculations of source x-ray intensity, spectrometer throughput, and spectral resolution are presented. Details of the conical-crystal focusing properties as well as the status of the instrumental design are also presented.
authors.affiliation: Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
authors.forename: K W
authors.initials: KW
authors.lastname: Hill
authors.affiliation: Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
authors.forename: M
authors.initials: M
authors.lastname: Bitter
authors.affiliation: Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
authors.forename: L
authors.initials: L
authors.lastname: Delgado-Aparicio
authors.affiliation: Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
authors.forename: P C
authors.initials: PC
authors.lastname: Efthimion
authors.affiliation: Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
authors.forename: R
authors.initials: R
authors.lastname: Ellis
authors.affiliation: Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
authors.forename: L
authors.initials: L
authors.lastname: Gao
authors.affiliation: Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
authors.forename: J
authors.initials: J
authors.lastname: Maddox
authors.affiliation: Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
authors.forename: N A
authors.initials: NA
authors.lastname: Pablant
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94551, USA.
authors.forename: M B
authors.initials: MB
authors.lastname: Schneider
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94551, USA.
authors.forename: H
authors.initials: H
authors.lastname: Chen
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94551, USA.
authors.forename: S
authors.initials: S
authors.lastname: Ayers
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94551, USA.
authors.forename: R L
authors.initials: RL
authors.lastname: Kauffman
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94551, USA.
authors.forename: A G
authors.initials: AG
authors.lastname: MacPhee
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94551, USA.
authors.forename: P
authors.initials: P
authors.lastname: Beiersdorfer
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94551, USA.
authors.forename: R
authors.initials: R
authors.lastname: Bettencourt
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94551, USA.
authors.forename: T
authors.initials: T
authors.lastname: Ma
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94551, USA.
authors.forename: R C
authors.initials: RC
authors.lastname: Nora
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94551, USA.
authors.forename: H A
authors.initials: HA
authors.lastname: Scott
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94551, USA.
authors.forename: D B
authors.initials: DB
authors.lastname: Thorn
authors.affiliation: General Atomics, San Diego, California 92121, USA.
authors.forename: J D
authors.initials: JD
authors.lastname: Kilkenny
authors.affiliation: Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA.
authors.forename: D
authors.initials: D
authors.lastname: Nelson
authors.affiliation: Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA.
authors.forename: M
authors.initials: M
authors.lastname: Shoup
authors.affiliation: Weizmann Institute of Science, Rehovot 76100, Israel.
authors.forename: Y
authors.initials: Y
authors.lastname: Maron