Pair filamentation and laser scattering in beam-driven QED cascades
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arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2023
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| _version_ | 1866911775504465920 |
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| author | Qu, Kenan Griffith, Alec Fisch, Nathaniel J. |
| author_facet | Qu, Kenan Griffith, Alec Fisch, Nathaniel J. |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_02107 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Pair filamentation and laser scattering in beam-driven QED cascades Qu, Kenan Griffith, Alec Fisch, Nathaniel J. Plasma Physics Accelerator Physics 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. |
| title | Pair filamentation and laser scattering in beam-driven QED cascades |
| topic | Plasma Physics Accelerator Physics |
| url | https://arxiv.org/abs/2312.02107 |