The high density γ-ray emission and dense positron production via multi-lasers driven circular target

2018/12/04 by Ya-Juan Hou, Bai-Song Xie, Chong Lv +5
Physics and Astronomy · #physics.plasm-ph

paper · pdf · doi:10.1088/2058-6272/ab1602

16 pages, 8 figures

arxiv created 2018/12/04 · arxiv updated 2019/09/04

Abstract

A diamond-like carbon circular target is proposed to improve the γ-ray emission and pair production with lasers intensity of 8× 10²² ~W/cm² by using two-dimensional particle-in-cell simulations with quantum electrodynamics. It is found that the circular target can significantly enhance the density of γ-photons than plane target when two colliding circularly polarized lasers irradiate the target. By multi-lasers irradiate the circular target, the optical trap of lasers can prevent the high energy electrons accelerated by laser radiation pressure from escaping. Hence, high density as 5164 n_c γ-photons is obtained through nonlinear Compton back-scattering. Meanwhile, 2.7 × 10¹¹ positrons with average energy of 230 ~MeV is achieved via multi-photon Breit-Wheeler process. Such ultrabright γ-ray source and dense positrons source can be useful to many applications. The optimal target radius and laser mismatching deviation parameters are also discussed in detail.

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