Development of a quadripartite wakefield structure as dechirper for free electron laser
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| Autores principales: | , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866917456466935808 |
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| author | Ji, Yu Lei, Congrui Shao, Jiahang Yu, Yong Sun, Jitao Wang, Xiaofan Yi, Huaiqian Li, Zongbin He, Lei Wang, Hongfei Wei, Jianping Wei, Wei Wang, Wei Yang, Jiayue Zhang, Weiqing Yang, Xueming |
| author_facet | Ji, Yu Lei, Congrui Shao, Jiahang Yu, Yong Sun, Jitao Wang, Xiaofan Yi, Huaiqian Li, Zongbin He, Lei Wang, Hongfei Wei, Jianping Wei, Wei Wang, Wei Yang, Jiayue Zhang, Weiqing Yang, Xueming |
| contents | Wakefield structures are critical for beam manipulation in free-electron lasers (FELs), particularly when serving as dechirpers, where beam-induced longitudinal wakefields compensate the energy chirp introduced during beam magnetic compression. However, conventional planar structures also generate time-dependent quadrupole wakefields due to their asymmetric geometry, which can cause beam mismatch and projected emittance growth. To address this limitation, we propose a quadripartite wakefield structure comprising four identical corrugated plates, able to fully suppress quadrupole wakefields while preserving strong longitudinal wakefields. To accurately evaluate its performance, we calculate wake potentials based on the Panofsky-Wenzel theorem using three-dimensional simulation software and extract the corresponding wake functions by deconvolution. We further adopt a particle-to-particle (P2P) tracking method incorporating these wake functions, which is capable of accounting for higher-order components and nonlinear effects that are typically neglected in standard tracking codes. Simulation results confirm that the quadripartite geometry offers significantly reduced projected emittance growth and a 25% shorter structure length compared with the planar design. The tracking method also reveals that the nonlinearities of three-dimensional wakefields induce noticeable slice emittance growth for large transverse beam sizes, which may in turn affect lasing performance. In addition, the tracking method enables analysis of various types of assembly error and indicates that misalignment along the direction of plate motion may severely degrade the emittance via dipole wakefields. Such misalignment can be mitigated through beam-based alignment and precise plate adjustment using high-resolution servo motors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_01840 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Development of a quadripartite wakefield structure as dechirper for free electron laser Ji, Yu Lei, Congrui Shao, Jiahang Yu, Yong Sun, Jitao Wang, Xiaofan Yi, Huaiqian Li, Zongbin He, Lei Wang, Hongfei Wei, Jianping Wei, Wei Wang, Wei Yang, Jiayue Zhang, Weiqing Yang, Xueming Accelerator Physics Wakefield structures are critical for beam manipulation in free-electron lasers (FELs), particularly when serving as dechirpers, where beam-induced longitudinal wakefields compensate the energy chirp introduced during beam magnetic compression. However, conventional planar structures also generate time-dependent quadrupole wakefields due to their asymmetric geometry, which can cause beam mismatch and projected emittance growth. To address this limitation, we propose a quadripartite wakefield structure comprising four identical corrugated plates, able to fully suppress quadrupole wakefields while preserving strong longitudinal wakefields. To accurately evaluate its performance, we calculate wake potentials based on the Panofsky-Wenzel theorem using three-dimensional simulation software and extract the corresponding wake functions by deconvolution. We further adopt a particle-to-particle (P2P) tracking method incorporating these wake functions, which is capable of accounting for higher-order components and nonlinear effects that are typically neglected in standard tracking codes. Simulation results confirm that the quadripartite geometry offers significantly reduced projected emittance growth and a 25% shorter structure length compared with the planar design. The tracking method also reveals that the nonlinearities of three-dimensional wakefields induce noticeable slice emittance growth for large transverse beam sizes, which may in turn affect lasing performance. In addition, the tracking method enables analysis of various types of assembly error and indicates that misalignment along the direction of plate motion may severely degrade the emittance via dipole wakefields. Such misalignment can be mitigated through beam-based alignment and precise plate adjustment using high-resolution servo motors. |
| title | Development of a quadripartite wakefield structure as dechirper for free electron laser |
| topic | Accelerator Physics |
| url | https://arxiv.org/abs/2605.01840 |