Abstract
The dependences of the temperature and the number of hot electrons on the size of the plasma corona of a thin foil target irradiated by a short relativistically intense laser pulse are investigated by three-dimensional numerical simulations. For a 30-fs long laser pulse with an energy of 300 mJ we have determined the optimal preplasma size which maximises the yield of forward-accelerated electrons capable of generating gamma-ray photons several MeV in energy. A study is made of gamma-ray generation by such laser-accelerated electrons in the bombardment of a converter target placed behind the laser target; the brightness of this gamma-ray source is shown to range up to 1015 photons s−1 mrad−2 mm−2 × (0.1 % BW)−1.
Published Version
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