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

This paper presents experimental scalings of the electrons and positrons produced by intense laser-target interactions at relativistic laser intensities (10{sup 18}–10{sup 20} W cm{sup −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{sub L}{sup 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. 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] ;  [2] ;  [3] ; ;  [4] ;  [5] ; ;  [6]
  1. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
  2. University of Nevada, Reno, Nevada 89557 (United States)
  3. LULI, Ecole Polytechnique, CNRS, CEA, UPMC, 91128 Palaiseau Cedex (France)
  4. Directorate of Science and Technology, AWE plc, Reading RG7 4PR (United Kingdom)
  5. University of Alberta, Edmonton, Alberta T6G 2R3 (Canada)
  6. LLE, University of Rochester, Rochester, New York 14623 (United States)
Publication Date:
OSTI Identifier:
22410420
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ACCELERATION; ELECTRONS; ENERGY SPECTRA; INTERACTIONS; LASER TARGETS; LASERS; NONLINEAR PROBLEMS; NUMERICAL ANALYSIS; PLASMA SHEATH; POSITRONS; PULSES; RELATIVISTIC RANGE