准单能Laser等离子体正电子加速器
Quasi-monoenergetic Laser-Plasma Positron Accelerator using Particle-Shower Plasma-Wave interactions
摘要：
建立了厘米级激光等离子体正电子全光加速器模型，用于产生超相对论能量可调的准单能光束。这里阐明的一个新原理描述了捕获发散正电子，这些正电子是激光驱动的电磁簇射的一部分，具有大的能量扩展，并且它们在激光驱动的等离子体波中加速成准单能正电子束。使用分析和Particle-In-Cell模拟证明了这一原理，在这里定义的限制下，现有的激光器可以加速数百MeV pC准单能正电子束。通过提供一个负担得起的替代更大规模的射频加速器，这种紧凑的正电子加速器开辟了新的研究途径。
英文摘要：
An all-optical centimeter-scale laser-plasma positron accelerator is modeled to produce quasi-monoenergetic beams with tunable ultra-relativistic energies. A new principle elucidated here describes the trapping of divergent positrons that are part of a laser-driven electromagnetic shower with a large energy spread and their acceleration into a quasi-monoenergetic positron beam in a laser-driven plasma wave. Proof of this principle using analysis and Particle-In-Cell simulations demonstrates that, under limits defined here, existing lasers can accelerate hundreds of MeV pC quasi-monoenergetic positron bunches. By providing an affordable alternative to kilometer-scale radio-frequency accelerators, this compact positron accelerator opens up new avenues of research.
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