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 · Mon Dec 05 23:00:00 EST 2016 · Physics of Plasmas

DOI: https://doi.org/10.1063/1.4971235 · OSTI ID:2567541

;

; Fiksel, G.;

;

; Krauland, C.; Link, A.; Manuel, M. J. -E.;

; Park, J.; Peebles, J.; Pollock, B. B.; Beg, F. N.; Betti, R.; Chen, Hui

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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Sponsoring Organization:: USDOE

OSTI ID:: 2567541

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

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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