Alignment effects on a neutron imaging system using coded apertures.
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.
Thfoin
Isabelle
I
CEA, DAM, DIF, F-91297 Arpajon, France.
Landoas
Olivier
O
Caillaud
Tony
T
Disdier
Laurent
L
Vincent
Maxime
M
Bourgade
Jean-Luc
JL
Rossé
Bertrand
B
Sangster
Thomas C
TC
Glebov
Vladimir Yu
VY
Pien
Greg
G
Armstrong
William
W