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Effect of the plasma density scale length on the properties of Brehmsstrahlung X-ray sources created by picosecond laser pulses

Abstract : Results of an experimental study of multi-MeV bremsstrahlung x-ray sources created by picosecond laser pulses are presented. The x-ray source is created by focusing the short pulse in an expanding plasma obtained by heating a solid target with a time-delayed nanosecond laser beam. The high-energy part of the x-ray spectrum and emission lobe are inferred from photonuclear activation techniques. The x-ray dose is measured with silicon diodes. Two-dimensional images of the source are reconstructed from a penumbral imaging technique. These results indicate the creation of a relatively small source, below 200 µm diameter, delivering doses up to 12 mrad in air at 1 m with x-ray temperature up to 2.8 MeV. The diagnostics used give access to a whole set of coherent experimental results on the x-ray source properties which are compared to extensive numerical simulations. X-ray intensity and temperature are found to increase with the size of the preplasma. ©2009 American Institute of Physics
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http://hal.in2p3.fr/in2p3-00360439
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Submitted on : Wednesday, February 11, 2009 - 11:55:07 AM
Last modification on : Sunday, May 24, 2020 - 11:12:03 AM

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Christian Courtois, A. Compant La Fontaine, O. Landoas, E. Lefebvre, G. Lidove, et al.. Effect of the plasma density scale length on the properties of Brehmsstrahlung X-ray sources created by picosecond laser pulses. Physics of Plasmas, American Institute of Physics, 2009, 16, pp.013105. ⟨10.1063/1.3067825⟩. ⟨in2p3-00360439⟩

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