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Title: The scaling of electron and positron generation in intense laser-solid interactions

This study presents experimental scalings of the electrons and positrons produced by intense laser-target interactions at relativistic laser intensities (10 18–10 20 W cm -2). The data were acquired from three short-pulse laser facilities with laser energies ranging from 80 to 1500 J. We found a non-linear (≈E L 2) scaling of positron yield [Chen et al., Phys. Rev. Lett. 114, 215001 (2015)] and a linear scaling of electron yield with the laser energy. These scalings are explained by theoretical and numerical analyses. Positron acceleration by the target sheath field is confirmed by the positron energy spectrum, which has a pronounced peak at energies near the sheath potential, as determined by the observed maximum energies of accelerated protons. The parameters of laser-produced electron-positron jets are summarized together with the theoretical energy scaling. Finally, the measured energy-squared scaling of relativistic electron-positron jets indicates the possibility to create an astrophysically relevant experimental platform with such jets using multi-kilojoule high intensity lasers currently under construction.
Authors:
 [1] ;  [1] ;  [2] ; ORCiD logo [3] ;  [1] ; ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [4] ;  [4] ;  [1] ;  [1] ; ORCiD logo [5] ;  [6] ;  [6] ; ORCiD logo [1] ;  [1] ;  [1] ; ORCiD logo [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Univ. of Nevada, Reno, NV (United States)
  3. Ecole Polytechnique, Palaiseau (France). Lab. for the Use of Intense Lasers (LULI)
  4. AWE plc, Reading (United Kingdom). Directorate of Science and Technology
  5. Univ. of Alberta, Edmonton, AB (Canada)
  6. Univ. of Rochester, NY (United States). Lab. for Laser Energetics (LLE)
Publication Date:
Report Number(s):
LLNL-JRNL-667679
Journal ID: ISSN 1070-664X
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; Journal Issue: 5; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE; LLNL Laboratory Directed Research and Development (LDRD) Program
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; positrons; photons; gold; protons; electron positron interactions
OSTI Identifier:
1251078
Alternate Identifier(s):
OSTI ID: 1228158