Damping dynamics of the centroid oscillation of a relativistic laser pulse in a plasma channel
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arXiv
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| Autori principali: | , , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866910192163094528 |
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| author | Xia, Yuhui Wang, Zhenan Tang, Ziyao Hu, Jianghao Liu, Xinyang Liu, Letian Man, Laifu Pan, Zhuo Wu, Di Pierce, Jacob R. Yan, Xueqing Lin, Chen Xu, Xinlu |
| author_facet | Xia, Yuhui Wang, Zhenan Tang, Ziyao Hu, Jianghao Liu, Xinyang Liu, Letian Man, Laifu Pan, Zhuo Wu, Di Pierce, Jacob R. Yan, Xueqing Lin, Chen Xu, Xinlu |
| contents | The centroid oscillation of an offset laser pulse propagating in a preformed plasma channel is investigated through theoretical analysis and three-dimensional particle-in-cell simulations. For non-relativistic laser pulses, the mode leakage of a finite channel and the temporal walk-off between the fundamental and high order modes of a finite-duration laser induce a decay in the laser centroid oscillation. An analytical model characterizing these decay mechanisms is derived and validated by simulations. For relativistic laser pulses, the slice-based centroid oscillation frequency develops an axial chirp due to relativistic channel modification and photon deceleration. This chirp leads to phase mixing across different axial slices of the pulse, resulting in a rapid damping of the overall centroid oscillation. Understanding this oscillation damping is crucial for mitigating electron beam pointing jitter and maintaining beam quality in high-energy, channel-guided laser wakefield accelerators. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_03918 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Damping dynamics of the centroid oscillation of a relativistic laser pulse in a plasma channel Xia, Yuhui Wang, Zhenan Tang, Ziyao Hu, Jianghao Liu, Xinyang Liu, Letian Man, Laifu Pan, Zhuo Wu, Di Pierce, Jacob R. Yan, Xueqing Lin, Chen Xu, Xinlu Accelerator Physics Plasma Physics The centroid oscillation of an offset laser pulse propagating in a preformed plasma channel is investigated through theoretical analysis and three-dimensional particle-in-cell simulations. For non-relativistic laser pulses, the mode leakage of a finite channel and the temporal walk-off between the fundamental and high order modes of a finite-duration laser induce a decay in the laser centroid oscillation. An analytical model characterizing these decay mechanisms is derived and validated by simulations. For relativistic laser pulses, the slice-based centroid oscillation frequency develops an axial chirp due to relativistic channel modification and photon deceleration. This chirp leads to phase mixing across different axial slices of the pulse, resulting in a rapid damping of the overall centroid oscillation. Understanding this oscillation damping is crucial for mitigating electron beam pointing jitter and maintaining beam quality in high-energy, channel-guided laser wakefield accelerators. |
| title | Damping dynamics of the centroid oscillation of a relativistic laser pulse in a plasma channel |
| topic | Accelerator Physics Plasma Physics |
| url | https://arxiv.org/abs/2605.03918 |