Positron generation using laser-wakefield electron sources

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

doi:10.1063/1.4931044

Title: Positron generation using laser-wakefield electron sources

Journal Article · Tue Sep 15 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4931044· OSTI ID:22493765

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

Lawrence Livermore National Laboratory, Livermore, California 94550 (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 (∼10{sup 7}), 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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OSTI ID:: 22493765

Journal Information:: Physics of Plasmas, Vol. 22, Issue 9; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X

Country of Publication:: United States

Language:: English

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Cited By (4)

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
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
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
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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Title: Positron generation using laser-wakefield electron sources

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