Enhanced ion acceleration using the high-energy petawatt PETAL laser

Raffestin D.; Lecherbourg L.; Lantuéjoul I.; Vauzour B.; Masson-Laborde P. E.; Davoine X.; Blanchot N.; Dubois J. L.; Vaisseau X.; d’Humières E.; Gremillet L.; Duval A.; Reverdin Ch.; Rosse B.; Boutoux G.; Ducret J. E.; Rousseaux Ch.; Tikhonchuk V.; Batani D.

doi:10.1063/5.0046679

Volume 6 Issue 5

Sep. 2021

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Raffestin D., Lecherbourg L., Lantuéjoul I., Vauzour B., Masson-Laborde P. E., Davoine X., Blanchot N., Dubois J. L., Vaisseau X., d’Humières E., Gremillet L., Duval A., Reverdin Ch., Rosse B., Boutoux G., Ducret J. E., Rousseaux Ch., Tikhonchuk V., Batani D.. Enhanced ion acceleration using the high-energy petawatt PETAL laser[J]. Matter and Radiation at Extremes, 2021, 6(5): 056901. doi: 10.1063/5.0046679

Citation:

Raffestin D., Lecherbourg L., Lantuéjoul I., Vauzour B., Masson-Laborde P. E., Davoine X., Blanchot N., Dubois J. L., Vaisseau X., d’Humières E., Gremillet L., Duval A., Reverdin Ch., Rosse B., Boutoux G., Ducret J. E., Rousseaux Ch., Tikhonchuk V., Batani D.. Enhanced ion acceleration using the high-energy petawatt PETAL laser[J]. Matter and Radiation at Extremes, 2021, 6(5): 056901. doi: 10.1063/5.0046679

Citation:

Raffestin D., Lecherbourg L., Lantuéjoul I., Vauzour B., Masson-Laborde P. E., Davoine X., Blanchot N., Dubois J. L., Vaisseau X., d’Humières E., Gremillet L., Duval A., Reverdin Ch., Rosse B., Boutoux G., Ducret J. E., Rousseaux Ch., Tikhonchuk V., Batani D.. Enhanced ion acceleration using the high-energy petawatt PETAL laser[J]. Matter and Radiation at Extremes, 2021, 6(5): 056901. doi: 10.1063/5.0046679

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Enhanced ion acceleration using the high-energy petawatt PETAL laser

doi: 10.1063/5.0046679

1.
CEA, DAM, CESTA, F-33116 Le Barp, France
2.
Centre Laser Intenses et Applications, Université de Bordeaux–CNRS–CEA, UMR 5107, 33405 Talence, France
3.
CEA, DAM, DIF, F-91297 Arpajon, France
4.
Université Paris–Saclay, CEA, LMCE, 91680 Bruyères-le-Châtel, France
5.
CEA, DRF, IRFU, GANIL, F-14000 Caen, France
6.
ELI-Beamlines Research Centre, 25241 Dolní Břežany, Czech Republic

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Corresponding author: a)Author to whom correspondence should be addressed: didier.raffestin@u-bordeaux.fr
Received Date: 2021-02-05
Accepted Date: 2021-07-18

Available Online: 2021-09-01

Publish Date: 2021-09-15

Abstract

Abstract

The high-energy petawatt PETAL laser system was commissioned at CEA’s Laser Mégajoule facility during the 2017–2018 period. This paper reports in detail on the first experimental results obtained at PETAL on energetic particle and photon generation from solid foil targets, with special emphasis on proton acceleration. Despite a moderately relativistic (<10¹⁹ W/cm²) laser intensity, proton energies as high as 51 MeV have been measured significantly above those expected from preliminary numerical simulations using idealized interaction conditions. Multidimensional hydrodynamic and kinetic simulations, taking into account the actual laser parameters, show the importance of the energetic electron production in the extended low-density preplasma created by the laser pedestal. This hot-electron generation occurs through two main pathways: (i) stimulated backscattering of the incoming laser light, triggering stochastic electron heating in the resulting counterpropagating laser beams; (ii) laser filamentation, leading to local intensifications of the laser field and plasma channeling, both of which tend to boost the electron acceleration. Moreover, owing to the large (∼100 μm) waist and picosecond duration of the PETAL beam, the hot electrons can sustain a high electrostatic field at the target rear side for an extended period, thus enabling efficient target normal sheath acceleration of the rear-side protons. The particle distributions predicted by our numerical simulations are consistent with the measurements.

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