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Updated: May 17, 2026

Applying X-ray Imaging Crystal Spectroscopy for Use as a High Temperature Plasma Diagnostic
Published on: August 25, 2016
Hard x-ray (>100 keV) imager to measure hot electron preheat for indirectly driven capsule implosions on the NIF
T Döppner1, E L Dewald, L Divol
1Lawrence Livermore National Laboratory, Livermore, California 94551, USA. doeppner1@llnl.gov
Abstract:
We have fielded a hard x-ray (>100 keV) imager with high aspect ratio pinholes to measure the spatially resolved bremsstrahlung emission from energetic electrons slowing in a plastic ablator shell during indirectly driven implosions at the National Ignition Facility. These electrons are generated in laser plasma interactions and are a source of preheat to the deuterium-tritium fuel. First measurements show that hot electron preheat does not limit obtaining the fuel areal densities required for ignition and burn.
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