Generating Cylindrical Vector γ Rays via Beam-Target Interactions: Towards Structured Light at High Energies
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arXiv
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866912548938317824 |
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| author | Cao, Yue Xue, Kun Liu, Si-Man Li, Zhong-Peng Hu, Li-Xiang Liu, Xin-Yu Dou, Zhen-Ke Wan, Feng Zhao, Qian Yu, Tong-Pu Li, Jian-Xing |
| author_facet | Cao, Yue Xue, Kun Liu, Si-Man Li, Zhong-Peng Hu, Li-Xiang Liu, Xin-Yu Dou, Zhen-Ke Wan, Feng Zhao, Qian Yu, Tong-Pu Li, Jian-Xing |
| contents | Structured γ rays, particularly cylindrical vector γ rays, offer promising tools for sub-nuclear imaging and polarization-sensitive probes in fundamental research and applications, but conventional optical methods face great challenges at such photon energy. Here, we put forward a novel method generating such γ rays through relativistic beam-target interactions. For instance, radially polarized γ rays can be generated by using a dense electron beam striking a multifoil target. We find that the radial polarization is transferred from the generated coherent transition radiation (CTR) fields to $γ$ photons through nonlinear Compton scattering, with the high polarization preserved by phase matching. Three-dimensional spin-resolved simulations demonstrate radial polarization degrees approaching 60\%. Furthermore, these γ rays can decay into azimuthally spin-polarized positrons via the nonlinear Breit-Wheeler process, with their spins aligning along the CTR magnetic field. Our work extends the concept of structured light into the γ-ray regime, offering new prospects for broad fields such as nuclear structure probing, fundamental symmetries tests, polarization-sensitive studies in extreme conditions, and laboratory astrophysical observations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_16220 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Generating Cylindrical Vector γ Rays via Beam-Target Interactions: Towards Structured Light at High Energies Cao, Yue Xue, Kun Liu, Si-Man Li, Zhong-Peng Hu, Li-Xiang Liu, Xin-Yu Dou, Zhen-Ke Wan, Feng Zhao, Qian Yu, Tong-Pu Li, Jian-Xing Optics Plasma Physics Structured γ rays, particularly cylindrical vector γ rays, offer promising tools for sub-nuclear imaging and polarization-sensitive probes in fundamental research and applications, but conventional optical methods face great challenges at such photon energy. Here, we put forward a novel method generating such γ rays through relativistic beam-target interactions. For instance, radially polarized γ rays can be generated by using a dense electron beam striking a multifoil target. We find that the radial polarization is transferred from the generated coherent transition radiation (CTR) fields to $γ$ photons through nonlinear Compton scattering, with the high polarization preserved by phase matching. Three-dimensional spin-resolved simulations demonstrate radial polarization degrees approaching 60\%. Furthermore, these γ rays can decay into azimuthally spin-polarized positrons via the nonlinear Breit-Wheeler process, with their spins aligning along the CTR magnetic field. Our work extends the concept of structured light into the γ-ray regime, offering new prospects for broad fields such as nuclear structure probing, fundamental symmetries tests, polarization-sensitive studies in extreme conditions, and laboratory astrophysical observations. |
| title | Generating Cylindrical Vector γ Rays via Beam-Target Interactions: Towards Structured Light at High Energies |
| topic | Optics Plasma Physics |
| url | https://arxiv.org/abs/2508.16220 |