title: Alignment effects on a neutron imaging system using coded apertures.
abstract: A high resolution neutron imaging system is being developed and tested on the OMEGA laser facility for inertial confinement fusion experiments. This diagnostic uses a coded imaging technique with a penumbral or an annular aperture. The sensitiveness of these techniques to misalignment was pointed out with both experiments and simulations. Results obtained during OMEGA shots are in good agreement with calculations performed with the Monte Carlo code GEANT4. Both techniques are sensitive to the relative position of the source in the field of view. The penumbral imaging technique then demonstrates to be less sensitive to misalignment compared to the ring. These results show the necessity to develop a neutron imaging diagnostic for megajoule class lasers taking into account our alignment capabilities on such facilities.
authors.affiliation: CEA, DAM, DIF, F-91297 Arpajon, France.
authors.forename: Isabelle
authors.initials: I
authors.lastname: Thfoin
authors.forename: Olivier
authors.initials: O
authors.lastname: Landoas
authors.forename: Tony
authors.initials: T
authors.lastname: Caillaud
authors.forename: Laurent
authors.initials: L
authors.lastname: Disdier
authors.forename: Maxime
authors.initials: M
authors.lastname: Vincent
authors.forename: Jean-Luc
authors.initials: JL
authors.lastname: Bourgade
authors.forename: Bertrand
authors.initials: B
authors.lastname: Rossé
authors.forename: Thomas C
authors.initials: TC
authors.lastname: Sangster
authors.forename: Vladimir Yu
authors.initials: VY
authors.lastname: Glebov
authors.forename: Greg
authors.initials: G
authors.lastname: Pien
authors.forename: William
authors.initials: W
authors.lastname: Armstrong