Alignment effects on a neutron imaging system using coded apertures

作者：Thfoin Isabelle^*; Landoas Olivier; Caillaud Tony; Disdier Laurent; Vincent Maxime; Bourgade Jean Luc; Rosse Bertrand; Sangster Thomas C; Glebov Vladimir Yu; Pien Greg; Armstrong William

来源：Review of Scientific Instruments, 2010, 81(3): 033503.

DOI：10.1063/1.3331494

• fusion reactors
• laser beam applications
• laser fusion
• Monte Carlo methods
• optical images

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.

• 出版日期2010-3
• 单位中国地震局