High-resolution multi-MeV x-ray radiography using relativistic laser-solid interaction

Courtois, C.; Edwards, R.; Compant La Fontaine, A.; Aedy, C.; Barbotin, M.; Bazzoli, S.; Biddle, L.; Brebion, D.; Bourgade, J. L.; Drew, D.; Fox, M.; Gardner, M.; Gazave, J.; Lagrange, J. M.; Landoas, O.; Le Dain, L.; Lefebvre, E.; Mastrosimone, D.; Pichoff, N.; Pien, G.
February 2011
Physics of Plasmas;Feb2011, Vol. 18 Issue 2, p023101
Academic Journal
When high intensity (≥1019 W cm-2) laser light interacts with matter, multi-MeV electrons are produced. These electrons can be utilized to generate a MeV bremsstrahlung x-ray emission spectrum as they propagate into a high-Z solid target positioned behind the interaction area. The short duration (<10 ps) and the small diameter (<500 μm) of the x-ray pulse combined with the MeV x-ray spectrum offers an interesting alternative to conventional bremsstrahlung x-ray sources based on an electron accelerator used to radiograph dense, rapidly moving objects. In experiments at the Omega EP laser, a multi-MeV x-ray source is characterized consistently with number of independent diagnostics. An unfiltered x-ray dose of approximately 2 rad in air at 1 m and a source diameter of less than 350 μm are inferred. Radiography of a complex and high area density (up to 61 g/cm2) object is then performed with few hundred microns spatial resolution.


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