【摘 要】
：
An efficient scheme for generating ultrabright γ-rays from the interaction of an intense laser pulse with a near-critical-density plasma is studied by using the two-dimensional particle-in-cell simulation including quantum electrodynamic ef-fects.We inves
【机 构】
：
School of Physics Science and Technology,Xinjiang University,Urumqi 830046,China;Key Laboratory of B
论文部分内容阅读
An efficient scheme for generating ultrabright γ-rays from the interaction of an intense laser pulse with a near-critical-density plasma is studied by using the two-dimensional particle-in-cell simulation including quantum electrodynamic ef-fects.We investigate the effects of target shape on γ-ray generation efficiency using three configurations of the solid foils attached behind the near-critical-density plasma:a fiat foil without a channel (target 1),a fiat foil with a channel (target 2),and a convex foil with a channel (target 3).When an intense laser propagates in a near-critical-density plasma,a large number of electrons are trapped and accelerated to GeV energy,and emit γ-rays via nonlinear betatron oscillation in the first stage.In the second stage,the accelerated electrons collide with the laser pulse reflected from the foil and emit high-energy,high-density γ-rays via nonlinear Compton scattering.The simulation results show that compared with the other two tar-gets,target 3 affords better focusing of the laser field and electrons,which decreases the divergence angle of γ-photons.Consequently,denser and brighter γ-rays are emitted when target 3 is used.Specifically,a dense γ-ray pulse with a peak brightness of 4.6 × 1026 photons/s/mm2/mrad2/0.1％BW (at 100 MeV) and 1.8 × 1023 photons/s/mm2/mrad2/0.1％BW (at 2 GeV) are obtained at a laser intensity of 8.5 × 1022 W/cm2 when the plasma density is equal to the critical plasma density nc.In addition,for target 3,the effects of plasma channel length,foil curvature radius,laser polarization,and laser intensity on the γ-ray emission are discussed,and optimal values based on a series of simulations are proposed.
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