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

Jie Zhao, Yan-Ting Hu, Yu Lu, Hao Zhang, Li-Xiang Hu, Xing-Long Zhu, Zheng-Ming Sheng, Ion Cristian Edmond Turcu, Alexander Pukhov, Fu-Qiu Shao, Tong-Pu Yu

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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.
Original languageEnglish
Article number15
JournalCommunications Physics
Issue number1
Publication statusPublished - 11 Jan 2022


  • electron-positron pairs
  • multi-petawatt (PW) lasers
  • Gaussian laser pulses


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