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

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.4921147· OSTI ID:1251078

This study presents experimental scalings of the electrons and positrons produced by intense laser-target interactions at relativistic laser intensities (1018–1020 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 (≈EL2) 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.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE; LLNL Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1251078
Alternate ID(s):
OSTI ID: 1228158
Report Number(s):
LLNL-JRNL-667679
Journal Information:
Physics of Plasmas, Vol. 22, Issue 5; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 34 works
Citation information provided by
Web of Science

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Cited By (15)

Multi-GeV electron-positron beam generation from laser-electron scattering journal March 2018
Spontaneous emergence of non-planar electron orbits during direct laser acceleration by a linearly polarized laser pulse journal February 2016
Ultrashort megaelectronvolt positron beam generation based on laser-accelerated electrons journal March 2016
Beyond the ponderomotive limit: Direct laser acceleration of relativistic electrons in sub-critical plasmas journal April 2016
Universal scalings for laser acceleration of electrons in ion channels journal October 2016
Target material dependence of positron generation from high intensity laser-matter interactions journal December 2016
High-energy (>70 keV) x-ray conversion efficiency measurement on the ARC laser at the National Ignition Facility journal March 2017
X-ray emission reduction and photon dose lowering by energy loss of fast electrons induced by return current during the interaction of a short-pulse high-intensity laser on a metal solid target journal April 2018
Simple scaling equations for electron spectra, currents, and bulk heating in ultra-intense short-pulse laser-solid interaction journal July 2018
High-angle deflection of the energetic electrons by a voluminous magnetic structure in near-normal intense laser-plasma interactions journal November 2018
Spontaneous emergence of non-planar electron orbits during direct laser acceleration by a linearly polarized laser pulse text January 2015
Beyond the ponderomotive limit: direct laser acceleration of relativistic electrons in sub-critical plasmas text January 2016
Universal scalings for laser acceleration of electrons in ion channels text January 2016
Multi-GeV electron-positron beam generation from laser-electron scattering preprint January 2017
High-angle Deflection of the Energetic Electrons by a Voluminous Magnetic Structure in Near-normal Intense Laser-plasma Interactions text January 2018

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