Targets for Laser proton acceleration.

Nassisi V., Delle Side D., Caricato A.P., Giove D., Kràsa J.

VI - Fisica applicata, acceleratori e beni culturali
Aula 29C-2 - Mercoledì 19 h 09:00 - 13:00
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We present a new method for hydrogen enrichment of targets for high-power laser-matter interaction. Transition metals ($\mathrm{Ta, Ti, Nb, Pd) are known as good $H_{2}$ adsorbers and absorbers. After a laser cleaning process of thin samples (thickness $\sim 10 \mu$m) a constant flow of $H_{2}$ was maintained inside a vacuum vessel. Next, we exposed the metal foils to 1500 laser pulses, in order to promote hydrogen adhesion. We tested the resulting targets at $PALS$ laboratory in Prague. Measurements showed a near 4-fold increase of proton yield (up to $5\times 10^{9}$ protons/shot) with respect to control.

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