Pair filamentation and laser scattering in beam-driven QED cascades

Autor:	Qu, Kenan, Griffith, Alec, Fisch, Nathaniel J.
Rok vydání:	2023
Předmět:	Physics - Plasma Physics Physics - Accelerator Physics
Druh dokumentu:	Working Paper
Popis:	We report the observation of longitudinal filamentation of an electron-positron pair plasma in a beam-driven QED cascade. The filaments are created in the "pair-reflection" regime, where the generated pairs are partially stopped and reflected in the strong laser field. The density filaments form near the center of the laser pulse and have diameters similar to the laser wavelength. They develop and saturate within a few laser cycles and do not induce sizable magnetostatic fields. We rule out the onset of two-stream instability or Weibel instability and attribute the origin of pair filamentation to laser ponderomotive forces. The small plasma filaments induce strong scattering of laser energy to large angles, serving as a signature of collective QED plasma dynamics. Comment: 9 pages, 9 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2312.02107 Zobrazit plný text záznamu View this record from Arxiv