arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1707.04841hep-ph
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超强场下单次非线性Compton散射和单次非线性Breit-Wheeler过程的多光子效应

Multi-photon Effects in Single Nonlinear Compton Scattering and Single Nonlinear Breit-Wheeler Process in Ultra Intense Fields

Bo Zhang, Zhi-meng Zhang, Zhi-gang Deng, Wei Hong, Jian Teng, Shu-kai He, Wei-min Zhou, Yu-qiu Gu

摘要:

非线性康普顿散射(NCS)和非线性Breit-Wheeler(NBW)过程是强多光子、高度非线性的过程。在超强激光器(归一化场振幅$a_0 \gg 1$)中,辐射形成长度比周期短得多,单个NCS/NBW不能被描述为电子与$γ$光子的散射,因为它们感觉到的是局部恒定的交叉场。然而,由于发散问题的存在,现有的常交叉场理论很难给出一些重要的量子特性,如涉及的激光光子数、瞬时角分布和详细的光谱。作为替代,目前对超强激光中单个NCS/NBW的理解包括几个经典和半量子的想法,如前向发射,反冲反应和光谱截止。通过从现有理论公式中提取单个过程所涉及的激光光子数,研究了超强激光中NCS/NBW的多光子效应。导出了超强激光中单个NCS的新特性,包括发射角与瞬时电子动量的关系固定、电子瞬时偏转、光谱截止消失等。在超强激光中,单个NBW也具有类似的特征,如发射角与瞬时$γ$光子动量的夹角不为零,光谱截止消失,光谱下限出现。模拟结果表明,在$10$ PW尺度和更强的激光作用下,多光子效应的相应信号是显著的。

英文摘要:

Nonlinear Compton scattering (NCS) and nonlinear Breit-Wheeler (NBW) process are strongly multi-photon and highly nonlinear processes. In ultra intense lasers (normalized field amplitude $a_0 \gg 1$), radiation formation length is much shorter than a period and single NCS/NBW cannot be described as scatterings of electrons dressing plane waves with $γ$ photons for what they feel is a local constant crossed field. However, present theories in constant crossed fields are hard to give some important quantum features due to divergence problems, such as number of laser photons involved, instantaneous angular distribution and detailed spectrum. As an alternative, present understanding of single NCS/NBW in ultra intense lasers includes several classical and semi-quantum ideas such as forward emission, recoil reaction and spectrum cutoff. We investigated multi-photon effects on NCS/NBW in ultra intense lasers by extracting the number of laser photons involved in a single process in ultra intense lasers from formulae of existing theories. New features of single NCS in ultra intense lasers including fixed emission angle to instantaneous electron momentum, instantaneous deflection of electron, and disappearance of spectrum cutoff are deduced. Similar features of single NBW in ultra intense lasers including non-vanishing emission angles to instantaneous $γ$ photon momentum, disappearance of spectrum cutoff and appearance of spectrum lower limit are also obtained. Simulations show that corresponding signals of multi-photon effects are significant on $10$PW scale and stronger lasers.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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