发表机构
York Plasma Institute, Department of Physics, University of York; GoLP/Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa; Department of Mechanical and Aerospace Engineering, University of California San Diego; General Atomics; Lawrence Livermore National Laboratory（约克大学等离子体研究所; 里斯本大学高等技术学院等离子体与核聚变研究所; 加州大学圣地亚哥分校机械与航空航天工程系; 通用原子能公司; 劳伦斯利弗莫尔国家实验室）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出一种简单实验装置，利用新发现的自组织正电子重定向与箍缩机制，将线性Breit-Wheeler过程的正电子信号增强2-3个数量级，并在低背景方向实现探测。
AI 中文摘要
线性Breit-Wheeler（LBW）过程（$\gamma+\gamma\rightarrow e^{-}+e^{+}$）是量子电动力学的一个基本预言，但迄今尚未在实验室条件下使用真实光子观测到。近年来，已有若干利用高强度（约$10^{22}$W/cm$^2$）激光-等离子体相互作用来观测LBW过程的实验方案被提出。然而，这些方案预计具有较高的信噪比要求，阻碍了通过真实光子对LBW过程的首次实验探测。在本文中，我们提出了一种简单的实验装置，与先前提出的方案相比，可将预期的正电子信号增强2-3个数量级，达到$10^{6}$MeV$^{-1}$str$^{-1}$的水平。此外，如此高的正电子信号是在与激光传播方向相反的方向上实现的，与先前关注的激光传播方向相比，该方向预计具有显著更低的背景噪声。实现这一结果的关键是一种新发现的自组织正电子重定向与箍缩机制，该机制由激光-等离子体相互作用中原位产生的强等离子体场促成。
英文摘要
The linear Breit-Wheeler (LBW) process ($γ+γ\rightarrow e^{-}+e^{+}$) is a fundamental prediction of quantum electrodynamics, but yet to be observed under laboratory conditions using real photons. In recent years, a few experimental schemes utilizing high-intense ($\sim10^{22}$W/cm$^2$) laser-plasma interactions to observe the LBW process have been proposed. However, a high level of signal-to-noise-ratio are expected in these schemes, hindering the first-ever experimental detection of the LBW process by real photons. In this paper, we present a simple experimental setup which could enhance the expected positron signals by 2-3 orders of magnitude compared to previously proposed schemes, reaching the level of $10^{6}$MeV$^{-1}$str$^{-1}$. Moreover, such high positron signal is achieve in the direction opposite to the laser propagation, where a significantly quieter background is expected compared to the previously focused direction of laser propagation. The key to achieve this result is a newly discovered self-organized positron reorienting and pinching mechanism, enabled by the in-situ strong plasma fields from the laser-plasma interaction.
