Ion acceleration by an ultrashort laser pulse interacting with a near-critical-density gas jet

17 Dec 2020 · M. Ehret, C. Salgado-Lopez, V. Ospina-Bohorquez, J. A. Perez-Hernandez, M. Huault, M. de Marco, J. I. Apinaniz, F. Hannachi, D. De Luis, J. Hernandez Toro, D. Arana, C. Mendez, O. Varela, A. Debayle, L. Gremillet, T. -H. Nguyen-Bui, E. Olivier, G. Revet, N. D. Bukharskii, H. Larreur, J. Caron, C. Vlachos, T. Ceccotti, D. Raffestin, P. Nicolai, J. L. Feugeas, M. Roth, X. Vaisseau, G. Gatti, L. Volpe, J. J. Santos ·

We demonstrate laser-driven Helium ion acceleration with cut-off energies above 25 MeV and peaked ion number above $10^8$ /MeV for 22(2) MeV projectiles from near-critical density gas jet targets. We employed shock gas jet nozzles at the high-repetition-rate (HRR) VEGA-2 laser system with 3 J in pulses of 30 fs focused down to intensities in the range between $9\times10^{19}$ W/cm$^2$ and $1.2\times10^{20}$ W/cm$^2$. We demonstrate acceleration spectra with minor shot-to-shot changes for small variations in the target gas density profile. Difference in gas profiles arise due to nozzles being exposed to a experimental environment, partially ablating and melting.

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Ion acceleration by an ultrashort laser pulse interacting with a near-critical-density gas jet

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