title: A comparison of "flat fielding" techniques for x-ray framing cameras.
abstract: Gain can vary across the active area of an x-ray framing camera by a factor of 4 (or more!) due to the voltage loss and dispersion associated with pulse transmission in a microstripline-coated microchannel plate. In order to make quantitative measurements, it is consequently important to measure the gain variation ("flat field"). Moreover, because of electromagnetic cross talk, gain variation depends on specific operational parameters, and ideally a flat field would be obtained at all operating conditions. As part of a collaboration between Lawrence Livermore National Laboratory's National Ignition Facility and the Commissariat à l'Énergie Atomique, we have been able to evaluate the consistency of three different methods of measuring x-ray flat fields. By applying all three methods to a single camera, we are able to isolate performance from method. Here we report the consistency of the methods and discuss systematic issues with the implementation and analysis of each.
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA.
authors.forename: L R
authors.initials: LR
authors.lastname: Benedetti
authors.affiliation: CEA-DAM, Ile de France, Bruyères-le Châtel, 91297 Arpajon Cedex, France.
authors.forename: C
authors.initials: C
authors.lastname: Trosseille
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA.
authors.forename: J P
authors.initials: JP
authors.lastname: Holder
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA.
authors.forename: K
authors.initials: K
authors.lastname: Piston
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA.
authors.forename: D
authors.initials: D
authors.lastname: Hargrove
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA.
authors.forename: D K
authors.initials: DK
authors.lastname: Bradley
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA.
authors.forename: P
authors.initials: P
authors.lastname: Bell
authors.affiliation: CEA-DAM, Ile de France, Bruyères-le Châtel, 91297 Arpajon Cedex, France.
authors.forename: J
authors.initials: J
authors.lastname: Raimbourg
authors.affiliation: CEA-DAM, Ile de France, Bruyères-le Châtel, 91297 Arpajon Cedex, France.
authors.forename: M
authors.initials: M
authors.lastname: Prat
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA.
authors.forename: L A
authors.initials: LA
authors.lastname: Pickworth
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA.
authors.forename: S F
authors.initials: SF
authors.lastname: Khan