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Progress toward the development and testing of source reconstruction methods for NIF neutron imaging
E N Loomis1, G P Grim, C Wilde
1Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA.
The Review of Scientific Instruments
|November 2, 2010
Summary
Developing neutron imaging analysis techniques for inertial confinement fusion implosions at the National Ignition Facility is crucial. Numerical inversion of pinhole images, accounting for neutron transport, is being tested for accuracy, even with pinhole misalignment.
Area of Science:
- Nuclear Fusion Science
- Plasma Physics
- Diagnostic Techniques
Background:
- Understanding inertial confinement fusion (ICF) implosions requires detailed analysis of neutron imaging data.
- Accurate fuel imaging is essential for extracting key implosion parameters like symmetry and areal density.
Purpose of the Study:
- To develop and validate analysis techniques for neutron imaging at the National Ignition Facility (NIF).
- To assess the effectiveness of numerical image inversion methods for ICF implosion analysis, specifically addressing pinhole misalignment.
Main Methods:
- Utilizing numerical inversion of pinhole images.
- Incorporating neutron transport simulations (Monte Carlo) through the pinhole aperture.
- Testing method robustness using simulated neutron images with varying pinhole misalignments.
Main Results:
- Demonstrated source reconstructions from simulated neutron images.
- Evaluated the impact of pinhole misalignment on the accuracy of fuel source reconstruction.
- Validated the effectiveness of the developed analysis technique under specific simulated conditions.
Conclusions:
- Numerical inversion of neutron pinhole images, informed by Monte Carlo simulations, shows promise for ICF implosion analysis.
- The developed technique's performance is sensitive to pinhole alignment, highlighting the need for precise experimental setups or advanced correction algorithms.
