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

Abstract

A diamond-like carbon circular target is proposed to improve the $\gamma$-ray emission and pair production with lasers intensity of $8\times 10^{22}W/c{\mathrm{m}}^2$ by using two-dimensional particle-in-cell simulations with quantum electrodynamics. It is found that the circular target can significantly enhance the density of $\gamma$-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 $5164n_c$ $\gamma$-photons is obtained through nonlinear Compton back-scattering. Meanwhile, $2.7\times 10^{11}$ positrons with average energy of $230\mathrm{MeV}$ is achieved via multi-photon Breit-Wheeler process. Such ultrabright $\gamma$-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.

16 pages, 8 figures

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Cited by in corpus (1)

• Brilliant attosecond γ-ray emission and high-yield positron production from intense laser-irradiated Nano-Micro array