Pump depletion and hot-electron generation in long-density-scale-length plasma with shock-ignition high-intensity laser
Abstract
Two-dimensional particle-in-cell simulations for laser plasma interaction with laser intensity of 1016W /cm2 , plasma density range of 0.01 -0.28 nc , and scale length of 230 -330 μ m showed significant pump depletion of the laser energy due to stimulated Raman scattering (SRS) and stimulated Brillouin scattering (SBS) in the low-density region (ne=0.01 -0.2 nc ). The simulations identified hot electrons generated by SRS in the low-density region with moderate energy and by two-plasmon-decay near ne=0.25 nc with higher energy. The overall hot electron temperature (46 keV) and conversion efficiency (3%) were consistent with the experiment's measurements. The simulations also showed artificially reducing SBS would lead to stronger SRS and a softer hot-electron spectrum.
- Publication:
-
Physical Review E
- Pub Date:
- March 2020
- DOI:
- 10.1103/PhysRevE.101.033206
- arXiv:
- arXiv:1910.12323
- Bibcode:
- 2020PhRvE.101c3206L
- Keywords:
-
- Physics - Plasma Physics
- E-Print:
- Phys. Rev. E 101, 033206 (2020)