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Enhancement of X-Ray Generation in a High-Repetition-Rate Laser-Plasma Experiment

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4 Author(s)
Rossall, A.K. ; Dept. of Phys., Univ. of York, York, UK ; Tallents, G.J. ; Wagenaars, E. ; Woolsey, N.C.

An approximate fourfold enhancement of X-ray generation per shot has been observed from a laser plasma after multiple laser shots onto a 2-mm-thick aluminum target produced ablation ("burn-through") over the thickness of the target. A table-top Nd:YAG laser with a pulse energy of 0.5 J, a pulse duration of 170 ps, a wavelength of 1.06 μm, and a 5-Hz repetition rate was utilized. Over multiple shots at an irradiance of 1015 W · cm-2, the peak hot electron temperature remained approximately constant at 6-7.5 ± 0.5 keV, indicating that the increased X-ray yield when the laser irradiates a burnt-through target results from an increase in the total number of hot electrons.

Published in:

Plasma Science, IEEE Transactions on  (Volume:39 ,  Issue: 11 )

Date of Publication:

Nov. 2011

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