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Efficient laser-driven proton and Bremsstrahlung generation from cluster-assembled foam targets

Prencipe, I.; Metzkes-Ng, J.; Pazzaglia, A.; Bernert, C.; Dellasega, D.; Fedeli, L.; Formenti, A.; Garten, M.; Kluge, T.; Kraft, S.; Laso García, A.; Maffini, A.; Obst-Hübl, L.; Rehwald, M.; Sobiella, M.; Zeil, K.; Schramm, U.; Cowan, T.; Passoni, M.

The interaction between intense 30 fs laser pulses and foam-coated 1.5 μm-thick Al foils in the relativistic regime (up to
5x10²⁰ W/cm2) is studied to optimize the laser energy conversion into laser-accelerated protons. A significant enhancement is
observed for foam targets in terms of proton cut-off energy (18.5 MeV) and number of protons above 4.7 MeV (4x10⁹
protons/shot) with respect to uncoated foils (9.5 MeV, 1x10⁹ protons/shot), together with a sixfold increase in the
Bremsstrahlung yield. This enhancement is attributed to increased laser absorption and electron generation in the foam meso-
and nanostructure.

Keywords: laser-driven ion acceleration; laser-driven Bremsstrahlung generation; TNSA; near-critical density plasma; nanostructured targets; foam targets

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Permalink: https://www.hzdr.de/publications/Publ-33045