Beam-Driven Transverse Deflecting Structure for Femtosecond Electron-Beam Diagnostics
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866918527563202560 |
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| author | Tomin, S. Bazyl, D. Decking, W. Zagorodnov, I. |
| author_facet | Tomin, S. Bazyl, D. Decking, W. Zagorodnov, I. |
| contents | High-resolution longitudinal phase-space (LPS) diagnostics are essential for X-ray free-electron lasers and advanced accelerators. Conventional radio-frequency transverse deflecting structures (TDSs) provide direct femtosecond-scale LPS measurements, but their substantial RF-power and infrastructure requirements strongly limit their deployment at multi-GeV beam energies. Here, we propose a beam-driven transverse deflecting structure in which a leading driver bunch, separated by one RF bucket from a trailing witness bunch under study, excites long-lived wakefields in a resonant cavity array. By placing the witness bunch near a zero crossing of the wakefield, the bunch experiences an approximately linear time-dependent transverse kick. Electromagnetic simulations of the resonant structure, combined with start-to-end beam-dynamics simulations based on European XFEL parameters at a final beam energy of 14 GeV, demonstrate a temporal resolution of $\sim 1.6$ fs for a 500 pC driver bunch, with a clear scaling toward the sub-femtosecond regime at higher charge. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_13752 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Beam-Driven Transverse Deflecting Structure for Femtosecond Electron-Beam Diagnostics Tomin, S. Bazyl, D. Decking, W. Zagorodnov, I. Accelerator Physics High-resolution longitudinal phase-space (LPS) diagnostics are essential for X-ray free-electron lasers and advanced accelerators. Conventional radio-frequency transverse deflecting structures (TDSs) provide direct femtosecond-scale LPS measurements, but their substantial RF-power and infrastructure requirements strongly limit their deployment at multi-GeV beam energies. Here, we propose a beam-driven transverse deflecting structure in which a leading driver bunch, separated by one RF bucket from a trailing witness bunch under study, excites long-lived wakefields in a resonant cavity array. By placing the witness bunch near a zero crossing of the wakefield, the bunch experiences an approximately linear time-dependent transverse kick. Electromagnetic simulations of the resonant structure, combined with start-to-end beam-dynamics simulations based on European XFEL parameters at a final beam energy of 14 GeV, demonstrate a temporal resolution of $\sim 1.6$ fs for a 500 pC driver bunch, with a clear scaling toward the sub-femtosecond regime at higher charge. |
| title | Beam-Driven Transverse Deflecting Structure for Femtosecond Electron-Beam Diagnostics |
| topic | Accelerator Physics |
| url | https://arxiv.org/abs/2605.13752 |