2020
DOI: 10.48550/arxiv.2012.09455
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Ion acceleration by an ultrashort laser pulse interacting with a near-critical-density gas jet

M. Ehret,
C. Salgado-Lopez,
V. Ospina-Bohorquez
et al.

Abstract: We demonstrate laser-driven Helium ion acceleration with cut-off energies above 25 MeV and peaked ion number above 10 8 MeV −1 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 9×10 19 Wcm −2 and 1.2×10 20 Wcm −2 . We demonstrate acceleration spectra with minor shot-to-shot changes for small variations in the target gas density … Show more

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“…2.29a). This could be due to the laser ablating the straight section of the shock nozzle [70], which inhibits the density peak formation by hindering the convergence of the hydrodynamic output flows (Fig. 2.24), as was previously discussed.…”
Section: Nozzle Damage Effect On the Transverse Density Profilesmentioning
confidence: 78%
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“…2.29a). This could be due to the laser ablating the straight section of the shock nozzle [70], which inhibits the density peak formation by hindering the convergence of the hydrodynamic output flows (Fig. 2.24), as was previously discussed.…”
Section: Nozzle Damage Effect On the Transverse Density Profilesmentioning
confidence: 78%
“…The advent of new high-intensity high-repetition-rate (HRR) facilities like Apollon (France), VEGA-3 (Spain), L4 Aton (ELI Beamlines, Czech Republic) or BELLA iP2 (USA) drives the application of this ion acceleration scheme using high-density gas-jets, a debris-free targetry compatible to HHR operation. Pioneer experiments have been conducted both in the TW [61,70] and the PW [65] regimes. In 2013 Sylla [61] reported on the transverse acceleration of He + ions up to 250 keV from a pure He gas with n e 0.2n c delivered by a supersonic conical nozzle and irradiated by LOA's Salle Jaune laser (E L = 0.8 J, τ L = 35 fs).…”
Section: Author Date Facility Laser Characteristics Target Observationsmentioning
confidence: 99%
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