1. Laser-driven betatron x rays for high-throughput imaging of additively manufactured materials.
- Author
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Senthilkumaran, V., Beier, N. F., Fourmaux, S., Shabaninezhad, P., Stinehart, J., Zhou, L., Moore, J. A., and Hussein, A. E.
- Subjects
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X-ray lasers , *X-rays , *LASER plasma accelerators , *THRESHOLD energy , *GAS mixtures - Abstract
Betatron x rays from a laser wakefield accelerator provide a new avenue for high-resolution, high-throughput radiography of solid materials. Here, we demonstrate the optimization of betatron x rays for three-dimensional tomography of defects in additively manufactured (AM) alloys at a repetition rate of 2.5 Hz. Using the Advanced Laser Light Source in Varennes, Qc, we characterized the x-ray energy spectrum, spatial resolution, beam stability, and emission length from three different gas targets {He, N2, and He–N2 [He (99.5%) + N2 (0.5%)] mixture} to determine the conditions for optimized imaging resolution with minimized acquisition time. Mixed He–N2 produced the highest x-ray critical energy (19 ± 5) keV and average brightness (∼ 3.3 × 1 0 10 photons/s/mm2/mrad2/0.1% BW) vs pure N2 gas (12 ± 4 keV and ∼ 1.6 × 1 0 10 photons/s/mm2/mrad2/0.1% BW). The mixed gas demonstrated the best beam stability and pointing compared to pure He gas. The optimization of betatron sources at 2.5 Hz for high-resolution imaging of micrometer-scale defects in AM alloys will enable high-throughput data collection, accelerating the characterization of complex mechanical deformation processes in these materials. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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