title: A test cassette for x-ray-exposure experiments at the National Ignition Facility.
abstract: We present the design and operation of a test cassette for exposure of samples to radiation environments at the National Ignition Facility. The cassette provides options for square and round samples and exposure areas; the cassette provides for multiple levels of filtration on a single sample, which allows dynamic range in experiments. The samples had normal lines of sight to the x-ray source in order to have uniform x-ray illumination. The incident x-radiation onto the samples was determined by the choice of filter thicknesses and materials. The samples were held at precise locations, accurate to within a few hundred microns, in the target chamber in order to have a known fluence incident. In the cassette, the samples were held in place in such a way that a minimal "line contact" allows them to have the maximal mechanical response to the x-ray load. We present postshot images of the debris found on films used for filters, and pre- and postexposure specimens.
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94551, USA. fournier2@llnl.gov
authors.forename: K B
authors.initials: KB
authors.lastname: Fournier
authors.forename: J
authors.initials: J
authors.lastname: Celeste
authors.forename: V
authors.initials: V
authors.lastname: Rekow
authors.forename: D R
authors.initials: DR
authors.lastname: Bopp
authors.forename: M J
authors.initials: MJ
authors.lastname: May
authors.forename: J H
authors.initials: JH
authors.lastname: Fisher
authors.forename: R
authors.initials: R
authors.lastname: Horton
authors.forename: C D
authors.initials: CD
authors.lastname: Newlander
authors.forename: P
authors.initials: P
authors.lastname: Jenkins
authors.forename: K
authors.initials: K
authors.lastname: Trautz