All-Optical Generation of Dense, Multi-GeV, Longitudinally-Polarized Positron Beams
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866915524547444736 |
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| author | Qin, Rui-Qi Xie, Peng-Pei Li, Yan-Fei Wu, Xian-Zhang Zuo, Zheng-Yang Li, Bing-Jun Liu, Jun Ji, Liang-Liang Li, Yu-Tong |
| author_facet | Qin, Rui-Qi Xie, Peng-Pei Li, Yan-Fei Wu, Xian-Zhang Zuo, Zheng-Yang Li, Bing-Jun Liu, Jun Ji, Liang-Liang Li, Yu-Tong |
| contents | The production of high-yield, longitudinally polarized positron beams represents an outstanding challenge in advanced accelerator science. Laser-driven schemes offer a compact alternative but typically yield only transverse polarization, or require pre-polarized electron beams, and struggle to efficiently accelerate positrons to high energies. Here, we introduce an all-optical scheme that overcomes these limitations by integrating positron generation, acceleration, and spin manipulation in a unified framework. Through a head-on collision between an ultraintense, circularly polarized laser pulse and a counterpropagating unpolarized electron beam, we drive a robust QED cascade. The nonlinear Breit-Wheeler process within the cascade produces positrons that are born directly within the strong laser field. Crucially, these positrons are instantaneously captured and accelerated to multi-GeV energies (up to $\sim$9 GeV) via a direct laser acceleration mechanism, while their spins are simultaneously rotated to longitudinal alignment by the field dynamics. Our Monte-Carlo simulations confirm the simultaneous achievement of a high positron yield ($\sim$20 $e^+/e^-$), a high average longitudinal polarization ($\sim$50\%), and GeV-scale energies. This all-optical source, feasible at upcoming ultraintense laser facilities, presents a compact and efficient solution for applications in collider physics and fundamental high-energy experiments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_25870 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | All-Optical Generation of Dense, Multi-GeV, Longitudinally-Polarized Positron Beams Qin, Rui-Qi Xie, Peng-Pei Li, Yan-Fei Wu, Xian-Zhang Zuo, Zheng-Yang Li, Bing-Jun Liu, Jun Ji, Liang-Liang Li, Yu-Tong Accelerator Physics Plasma Physics The production of high-yield, longitudinally polarized positron beams represents an outstanding challenge in advanced accelerator science. Laser-driven schemes offer a compact alternative but typically yield only transverse polarization, or require pre-polarized electron beams, and struggle to efficiently accelerate positrons to high energies. Here, we introduce an all-optical scheme that overcomes these limitations by integrating positron generation, acceleration, and spin manipulation in a unified framework. Through a head-on collision between an ultraintense, circularly polarized laser pulse and a counterpropagating unpolarized electron beam, we drive a robust QED cascade. The nonlinear Breit-Wheeler process within the cascade produces positrons that are born directly within the strong laser field. Crucially, these positrons are instantaneously captured and accelerated to multi-GeV energies (up to $\sim$9 GeV) via a direct laser acceleration mechanism, while their spins are simultaneously rotated to longitudinal alignment by the field dynamics. Our Monte-Carlo simulations confirm the simultaneous achievement of a high positron yield ($\sim$20 $e^+/e^-$), a high average longitudinal polarization ($\sim$50\%), and GeV-scale energies. This all-optical source, feasible at upcoming ultraintense laser facilities, presents a compact and efficient solution for applications in collider physics and fundamental high-energy experiments. |
| title | All-Optical Generation of Dense, Multi-GeV, Longitudinally-Polarized Positron Beams |
| topic | Accelerator Physics Plasma Physics |
| url | https://arxiv.org/abs/2509.25870 |