COURTOIS, Christian; COMPANT LA FONTAINE, A.; LANDOAS, O.; LEFEBVRE, E.; LIDOVE, G.; MÉOT, V.; MOREL, Pierre; NUTER, R.; BOSCHERON, A.; GRENIER, J.; M. ALÉONARD, M.; GERBAUX, M.; GOBET, F.; HANNACHI, F.; MALKA, G.; N. SCHEURER, J.; TARISIEN, M.

doi:10.1063/1.3067825

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COURTOIS, Christian
DAM Île-de-France [DAM/DIF]

COMPANT LA FONTAINE, A.
DAM Île-de-France [DAM/DIF]

LANDOAS, O.
DAM Île-de-France [DAM/DIF]

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Physics of Plasmas. 2009-01-23, vol. 16, p. 013105

American Institute of Physics

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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< Réduire

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

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