Positron generation using laser-wakefield electron sources

Williams, G. J.; Pollock, B. B.; Albert, F.; Park, J.; Chen, Hui

doi:10.1063/1.4931044

Title: Positron generation using laser-wakefield electron sources

Journal Article · Mon Sep 21 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4931044· OSTI ID:1839863

^[1]; Pollock, B. B. ^[2]; Albert, F. ^[2]; Park, J. ^[1]; Chen, Hui ^[2]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Davis, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Positron generation, using wakefield-accelerated electrons driven into a converter target, was investigated experimentally and through Monte Carlo simulations. Using experimentally measured initial electron distributions from a 60 fs laser system, modeling shows that a collimated wakefield electron beam of moderate energy (50–200 MeV) produces a large number of positrons (~10⁷), which are emitted from the rear of a mm-scale, high-Z target with divergence angles between 50 and 150 mrad. The large perpendicular momentum of the positrons was found to be dominated by contributions from multiple small angle Coulomb scattering. Positrons were not observed above background noise for a range of targets where simulations indicate a 5–30× increase in the beam charge was necessary to exceed threshold detection. These results provide new understanding to the fundamental limitations of creating narrow-divergence, high-density positron beams from laser-wakefield platforms for use in future laboratory pair plasma experiments.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: AC52-07NA27344; AC52- 07NA27344; LDRD 13-LW-076

OSTI ID:: 1839863

Alternate ID(s):: OSTI ID: 1420612

Report Number(s):: LLNL-JRNL-667670; 789384; TRN: US2301137

Journal Information:: Physics of Plasmas, Vol. 22, Issue 9; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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Laser-driven high-quality positron sources as possible injectors for plasma-based accelerators Alejo, Aaron; Walczak, Roman; Sarri, Gianluca Scientific Reports, Vol. 9, Issue 1 https://doi.org/10.1038/s41598-019-41650-y	journal	March 2019
High-energy radiation and pair production by Coulomb processes in particle-in-cell simulations Martinez, B.; Lobet, M.; Duclous, R. Physics of Plasmas, Vol. 26, Issue 10 https://doi.org/10.1063/1.5118339	journal	October 2019
Ultrashort megaelectronvolt positron beam generation based on laser-accelerated electrons Xu, Tongjun; Shen, Baifei; Xu, Jiancai Physics of Plasmas, Vol. 23, Issue 3 https://doi.org/10.1063/1.4943280	journal	March 2016
Laser-driven high-quality positron sources as possible injectors for plasma-based accelerators Alejo, Aaron; Walczak, Roman; Sarri, Gianluca arXiv https://doi.org/10.48550/arxiv.1806.02633	preprint	January 2018

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