通过靶参数控制紧聚焦10 PW级激光与多组分等离子体的相互作用：电子-正电子对和γ光子源的优化
Controlling the interaction of tightly focused 10-PW class lasers with multicomponent plasma via target parameters: optimization of electron-positron pair and $γ$-photon sources
AI总结：
本文利用三维QED-PIC模拟发现靶电子初始总数可作为数十PW紧聚焦激光与波长尺度靶相互作用的相似性参数，并据此划分作用模式、优化电子-正电子对与γ光子源。
摘要：
多拍瓦激光与等离子体的相互作用是一个复杂的多参数问题，为基础研究提供了广阔领域，并为创造高能电子和正电子、稠密对等离子体以及γ光子的独特来源开辟了巨大机遇。然而，为实现此类来源的高效率，必须针对给定激光参数使用具有优化参数（主要是密度和尺寸）的靶。利用三维QED-PIC模拟表明，当尺寸与激光波长相当的靶被总功率为数十PW的激光束辐照时，靶电子的初始总数可被视为激光-等离子体相互作用的相似性参数。在实践中，这可显著简化控制相互作用所需靶的选择，从而相应实现所发展的电子-正电子等离子体和γ光子源的指定参数。基于该相似性参数，识别了不同的激光-等离子体相互作用模式，确定了启动这些模式的必要条件，并揭示了对粒子和γ光子源的性质。此外，还获得了对此类来源的数量和能量特性的定性估计，使其能够针对各种激光束构型进行优化。
英文摘要：
The interaction of multipetawatt lasers with plasma is a complex multiparameter problem, providing a wide field for fundamental research and opening up great opportunities for creating unique sources of high-energy electrons and positrons, dense pair plasma, and $γ$-photons. However, to achieve high efficiency of such a source, it is necessary to use targets with optimized parameters, primarily density and size, for the given laser parameters. With the use of 3D QED-PIC modeling it is shown that, when targets whose size is comparable with the laser wavelength are irradiated by laser beams with a total power of several tens of PW, the total initial number of target electrons may be regarded to be the similarity parameter of laser-plasma interaction. In practice, this can significantly simplify the selection of the targets needed for controlling the interaction and, accordingly, for achieving the specified parameters of the developed electron-positron plasma and $γ$-photon sources. Based on the similarity parameter, various laser-plasma interaction modes are identified, the necessary conditions for their launch are determined, and the properties of the pair particle and $γ$-photon source are revealed. Moreover, qualitative estimates of the quantitative and energy characteristics of such a source are obtained, allowing it to be optimized for various laser beam configurations.
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。
