학술논문
Ion acceleration by an ultrashort laser pulse interacting with a near-critical-density gas jet
Document Type
Working Paper
Author
Ehret, M.; Salgado-Lopez, C.; Ospina-Bohorquez, V.; Perez-Hernandez, J. A.; Huault, M.; de Marco, M.; Apinaniz, J. I.; Hannachi, F.; De Luis, D.; Toro, J. Hernandez; Arana, D.; Mendez, C.; Varela, O.; Debayle, A.; Gremillet, L.; Nguyen-Bui, T. -H.; Olivier, E.; Revet, G.; Bukharskii, N. D.; Larreur, H.; Caron, J.; Vlachos, C.; Ceccotti, T.; Raffestin, D.; Nicolai, P.; Feugeas, J. L.; Roth, M.; Vaisseau, X.; Gatti, G.; Volpe, L.; Santos, J. J.
Source
Subject
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Abstract
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.
Comment: 22 pages, 28 figures
Comment: 22 pages, 28 figures