An intense collimated beam of high-energy protons is emitted normal to the rear surface of thin solid targets irradiated at 1 PW power and peak intensity $3\ifmmode\times\else\texttimes\fi{}{10}^{20}\mathrm{W}{\mathrm{cm}}^{\ensuremath{-}2}$. Up to 48 J ( $12%$) of the laser energy is transferred to...
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