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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2508.11148 |
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| _version_ | 1866913993179791360 |
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| author | Sun, Ting Dou, Zhen-Ke Huang, Ya-Qing Wan, Feng Zhao, Qian Li, Jian-Xing |
| author_facet | Sun, Ting Dou, Zhen-Ke Huang, Ya-Qing Wan, Feng Zhao, Qian Li, Jian-Xing |
| contents | Plasma-based acceleration of positrons attracts extensive interests due to the ultrahigh accelerating gradient and ultrashort duration, while generating wakefield positron beam by the inherent injection is still a great challenge. Here, we put forward a superponderomotive injection method of positrons in the blowout regime of laser wakefield acceleration. In this method, transverse laser fields facilitate the trapping of positrons into the laser-modulated longitudinal wakefield which dominates the subsequent energy gaining, that is distinct from the electrostatic induced superponderomotive electrons. Particle-in-cell simulations demonstrate that this method can be implemented by the collision between a donut wake and a pair jet, resulting in the multi-cycle positron beam with hundreds of pC charge and brightness of $10^{13}~\rm{Am}^{-2}$. Such a collisional setup is available in the current laser-plasma experiments, and the generated positron beam is favorable for developing next generation of electron-positron collider, modeling the laboratory astrophysics and performing the ultrafast material diagnostics research. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_11148 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Generation of Ultrabrilliant Positron Beam via Superponderomotive Injection in Laser Wakefield Acceleration Sun, Ting Dou, Zhen-Ke Huang, Ya-Qing Wan, Feng Zhao, Qian Li, Jian-Xing Plasma Physics Accelerator Physics Plasma-based acceleration of positrons attracts extensive interests due to the ultrahigh accelerating gradient and ultrashort duration, while generating wakefield positron beam by the inherent injection is still a great challenge. Here, we put forward a superponderomotive injection method of positrons in the blowout regime of laser wakefield acceleration. In this method, transverse laser fields facilitate the trapping of positrons into the laser-modulated longitudinal wakefield which dominates the subsequent energy gaining, that is distinct from the electrostatic induced superponderomotive electrons. Particle-in-cell simulations demonstrate that this method can be implemented by the collision between a donut wake and a pair jet, resulting in the multi-cycle positron beam with hundreds of pC charge and brightness of $10^{13}~\rm{Am}^{-2}$. Such a collisional setup is available in the current laser-plasma experiments, and the generated positron beam is favorable for developing next generation of electron-positron collider, modeling the laboratory astrophysics and performing the ultrafast material diagnostics research. |
| title | Generation of Ultrabrilliant Positron Beam via Superponderomotive Injection in Laser Wakefield Acceleration |
| topic | Plasma Physics Accelerator Physics |
| url | https://arxiv.org/abs/2508.11148 |