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Enhanced electron-positron pair production by ultra intense laser irradiating a compound target

机译:通过超强激光辐照复合靶提高电子对正电子的产生

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摘要

High-energy-density electron-positron pairs play an increasingly important role in many potential applications. Here, we propose a scheme for enhanced positron production by an ultra intense laser irradiating a gas-Al compound target via the multi-photon Breit-Wheeler (BW) process. The laser pulse first ionizes the gas and interacts with a near-critical-density plasma, forming an electron bubble behind the laser pulse. A great deal of electrons are trapped and accelerated in the bubble, while the laser front hole-bores the Al target and deforms its front surface. A part of the laser wave is thus reflected by the inner curved target surface and collides with the accelerated electron bunch. Finally, a large number of. photons are emitted in the forward direction via the Compton back-scattering process and the BW process is initiated. Dense electron-positron pairs are produced with a maximum density of 6.02x10(27) m(-3). Simulation results show that the positron generation is greatly enhanced in the compound target, where the positron yield is two orders of magnitude greater than that in only the solid slab case. The influences of the laser intensity, gas density and length on the positron beam quality are also discussed, which demonstrates the feasibility of the scheme in practice.
机译:高能量密度电子-正电子对在许多潜在应用中扮演着越来越重要的角色。在这里,我们提出了一种通过多光子Breit-Wheeler(BW)工艺通过超强激光辐照气-铝化合物靶来提高正电子产量的方案。激光脉冲首先使气体电离,并与接近临界密度的等离子体相互作用,从而在激光脉冲后面形成电子气泡。大量电子被俘获并在气泡中加速,而激光前孔则使Al靶钻孔并使其前表面变形。激光的一部分因此被内部弯曲的目标表面反射并与加速的电子束碰撞。最后,大量的。光子通过康普顿反向散射过程向前发射,然后开始BW过程。产生最大密度为6.02x10(27)m(-3)的致密电子-正电子对。仿真结果表明,在复合靶中,正电子的产生大大增强,其中正电子的产量比仅在固态平板情况下高两个数量级。讨论了激光强度,气体密度和长度对正电子束质量的影响,证明了该方案在实践中的可行性。

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