Target material dependence of positron generation from high intensity laser-matter interactions

Williams, G. J.; Barnak, D.; Fiksel, G.; Hazi, A.; Kerr, S.; Krauland, C.; Link, A.; Manuel, M. J. -E.; Nagel, S. R.; Park, J.; Peebles, J.; Pollock, B. B.; Beg, F. N.; Betti, R.; Chen, Hui

doi:10.1063/1.4971235

Title: Target material dependence of positron generation from high intensity laser-matter interactions

Journal Article · Tue Dec 06 00:00:00 EST 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4971235· OSTI ID:1343026

^[1];

^[2]; Fiksel, G. ^[3];

^[4];

^[5]; Krauland, C. ^[6]; Link, A. ^[4]; Manuel, M. J. -E. ^[7];

^[4]; Park, J. ^[4]; Peebles, J. ^[6]; Pollock, B. B. ^[4]; Beg, F. N. ^[6]; Betti, R. ^[2]; Chen, Hui ^[4]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Davis, CA (United States)
Univ. of Rochester, Rochester, NY (United States)
Univ. of Rochester, Rochester, NY (United States); Univ. of Michigan, Ann Arbor, MI (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Alberta, Edmonton, AB (Canada)
Univ. of California San Diego, La Jolla, CA (United States)
Univ. of Michigan, Ann Arbor, MI (United States)

Here, the effective scaling of positron-electron pair production by direct, ultraintense laser-matter interaction is investigated for a range of target materials and thicknesses. An axial magnetic field, acting as a focusing lens, was employed to measure positron signals for targets with atomic numbers as low as copper (Z – 29). The pair production yield was found to be consistent with the Bethe-Heitler mechanism, where the number of positrons emitted into a 1 steradian cone angle from the target rear was found to be proportional to Z². The unexpectedly low scaling results from Coulomb collisions that act to stop or scatter positrons into high angles. Monte Carlo simulations support the experimental results, providing a comprehensive power-law scaling relationship for all elemental materials and densities.

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

Sponsoring Organization:: USDOE

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

OSTI ID:: 1343026

Alternate ID(s):: OSTI ID: 1420605

Report Number(s):: LLNL-JRNL-680072; TRN: US1701176

Journal Information:: Physics of Plasmas, Vol. 23, Issue 12; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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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
Enhanced electron acceleration in aligned nanowire arrays irradiated at highly relativistic intensities Moreau, A.; Hollinger, R.; Calvi, C. Plasma Physics and Controlled Fusion, Vol. 62, Issue 1 https://doi.org/10.1088/1361-6587/ab4d0c	journal	November 2019

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