All-optical quasi-monoenergetic GeV positron bunch generation by twisted laser fields

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Abstract

Generation of energetic electron-positron pairs using multi-petawatt (PW) lasers has recently attracted increasing interest. However, some previous laser-driven positron beams have severe limitations in terms of energy spread, beam duration, density, and collimation. Here we propose a scheme for the generation of dense ultra-short quasi-monoenergetic positron bunches by colliding a twisted laser pulse with a Gaussian laser pulse. In this scheme, abundant γ-photons are first generated via nonlinear Compton scattering and positrons are subsequently generated during the head-on collision of γ-photons with the Gaussian laser pulse. Due to the unique structure of the twisted laser pulse, the positrons are confined by the radial electric fields and experience phase-locked-acceleration by the longitudinal electric field. Three-dimensional simulations demonstrate the generation of dense sub-femtosecond quasi-monoenergetic GeV positron bunches with tens of picocoulomb (pC) charge and extremely high brilliance above 1014 s−1 mm−2 mrad−2 eV−1, making them promising for applications in laboratory physics and high energy physics.

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Zhao, J., Hu, Y. T., Lu, Y., Zhang, H., Hu, L. X., Zhu, X. L., … Yu, T. P. (2022). All-optical quasi-monoenergetic GeV positron bunch generation by twisted laser fields. Communications Physics, 5(1). https://doi.org/10.1038/s42005-021-00797-9

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