Matter and Radiation at Extremes, Volume. 9, Issue 2, 024001(2024)
Collisionless shock acceleration of protons in a plasma slab produced in a gas jet by the collision of two laser-driven hydrodynamic shockwaves
Fig. 1. Sketch of the experimental arrangement. (a)–(c) Side view (from the
Fig. 2. Probe beam shadography from the plasma generated by the interaction of the ps beam with the high-density H2 gas jet, at different backing pressures and different times from the ps-pulse arrival: (a)–(c) LULI experiment; (d) GSI experiment. At the top of each image (
Fig. 3. Time-resolved (streak camera) shadowgraphs along the ps-beam axis (
Fig. 4. Proton spectra from the LULI experiment, without plasma tailoring, measured at 0°, 30°, and 70° from the ps-beam axis, for different gas jet backing pressures. The dashed lines are the noise levels of each spectrum. The laser-plasma parameters are the same as in
Fig. 5. (a) Time-resolved [along the ps-beam axis (streak camera)] and (b) 2D space-resolved (GOI snapshot) shadowgraphs of the plasma tailored by one ns beam, at the entrance side of the ps beam, for a gas jet backing pressure of 200 bars. The dashed orange line highlights the croissant-like shape produced by the expansion of the HSW [see also
Fig. 6. Proton spectra from the LULI experiment, associated with the shadowgraphs of
Fig. 7. (a) Time-resolved [along the ps-beam axis (streak camera)] and (b) 2D space-resolved (GOI snapshot) shadowgraphs of the plasma tailored on the two opposite sides for a gas jet backing pressure of 200 bars. The energy in each ns beam is 4.5 J. The orange arrows in (a) indicates the minimum width of the shadowgraph (collision of the two HSWs). The horizontal line at
Fig. 8. 2D space-resolved (GOI snapshot) shadowgraphs of the plasma tailored on the two opposite sides, for a gas jet backing pressure of 300 bars, at two different times: (a) before the collision of the HSWs; (b) just after their collision and the arrival of the ps pulse. The blue dashed lines indicate the edges of the shadowgraph measured without plasma tailoring (
Fig. 9. Proton spectra from four laser shots on the LULI experiment, in the case of a plasma tailored on both sides (as in
Fig. 10. Typical result from the GSI experiment: (a) 2D space-resolved (GOI snapshot) shadowgraph of the plasma tailored on both sides; (b) associated proton spectrum measured at 50°. The gas jet backing pressure was 100 bars. The shadowgraph is 40 ps before the ps-pulse arrival.
Fig. 11. (a) Temporal evolution of the density profile along the ps-beam axis from 3D TROLL simulations. The two ns beams are focused 300
Fig. 12. Same as
Fig. 13. Spatial profiles of (a) the laser focal spot, (b) the electron temperature, (c) the electron density for the case without the wing in the intensity profile (left,
Get Citation
Copy Citation Text
J.-R. Marquès, L. Lancia, P. Loiseau, P. Forestier-Colleoni, M. Tarisien, E. Atukpor, V. Bagnoud, C. Brabetz, F. Consoli, J. Domange, F. Hannachi, P. Nicolaï, M. Salvadori, B. Zielbauer. Collisionless shock acceleration of protons in a plasma slab produced in a gas jet by the collision of two laser-driven hydrodynamic shockwaves[J]. Matter and Radiation at Extremes, 2024, 9(2): 024001
Category:
Received: Sep. 26, 2023
Accepted: Dec. 5, 2023
Published Online: Apr. 15, 2024
The Author Email: Marquès J.-R. (jean-raphael.marques@polytechnique.fr)