Upstream Laser-based Longitudinal Enhancement of Relativistic Photoelectrons
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866914238121902080 |
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| author | Zhang, Hao Lemons, Randy Hirschman, Jack Neveu, Nicole Sudar, Nicolas Robles, River Franz, Paris Cesar, David Zhu, Zihan Britton, Mathew Borne, Kurtis Zhang, Zhen Larsen, Kirk A. Mencer, Benjamin Baker, Justin Pennington, Chad Obaid, Razib Ding, Yuantao Coffee, Ryan Just, Gabriel Zhou, Feng Qiang, Ji Cryan, James Robinson, Joseph Marinelli, Agostino Carbajo, Sergio |
| author_facet | Zhang, Hao Lemons, Randy Hirschman, Jack Neveu, Nicole Sudar, Nicolas Robles, River Franz, Paris Cesar, David Zhu, Zihan Britton, Mathew Borne, Kurtis Zhang, Zhen Larsen, Kirk A. Mencer, Benjamin Baker, Justin Pennington, Chad Obaid, Razib Ding, Yuantao Coffee, Ryan Just, Gabriel Zhou, Feng Qiang, Ji Cryan, James Robinson, Joseph Marinelli, Agostino Carbajo, Sergio |
| contents | Controlling the longitudinal phase space of high-brightness relativistic electron beams is crucial for advancing a broad spectrum of charged-particle-based instrumentation and scientific frontiers. A generalized method for achieving this control involves manipulating the photoemission laser's temporal distribution at the picosecond level, a long-standing technical challenge. Recent developments in laser shaping have enabled the creation of high-power, picosecond-scale symmetrical and asymmetrical temporal profiles, capable of fine-tuning complex space-charge dynamics and external field effects in relativistic charged-particle beams. Here, we demonstrate that rather than deviations from theorized, idealized laser distributions, a controlled asymmetry can be harnessed to counteract accelerator-induced distortions. By implementing spatiotemporal shaping of the ultraviolet photocathode laser at the LCLS-II superconducting injector, we achieve deterministic control over the longitudinal phase space without downstream corrections. We find that this optical asymmetry induces a self-linearizing effect across both low (40 pC) and high (80 pC) charge regimes, effectively suppressing nonlinear compression and energy chirp. Consequently, this approach is expected to preserve a low emittance comparable to that of ideal flattop or regular Gaussian profiles, while delivering superior current uniformity and shot-to-shot stability. These results establish spatiotemporal laser shaping as a compact, generalizable tool for directly optimizing beam brightness at the source. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_03580 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Upstream Laser-based Longitudinal Enhancement of Relativistic Photoelectrons Zhang, Hao Lemons, Randy Hirschman, Jack Neveu, Nicole Sudar, Nicolas Robles, River Franz, Paris Cesar, David Zhu, Zihan Britton, Mathew Borne, Kurtis Zhang, Zhen Larsen, Kirk A. Mencer, Benjamin Baker, Justin Pennington, Chad Obaid, Razib Ding, Yuantao Coffee, Ryan Just, Gabriel Zhou, Feng Qiang, Ji Cryan, James Robinson, Joseph Marinelli, Agostino Carbajo, Sergio Optics High Energy Physics - Experiment Applied Physics Controlling the longitudinal phase space of high-brightness relativistic electron beams is crucial for advancing a broad spectrum of charged-particle-based instrumentation and scientific frontiers. A generalized method for achieving this control involves manipulating the photoemission laser's temporal distribution at the picosecond level, a long-standing technical challenge. Recent developments in laser shaping have enabled the creation of high-power, picosecond-scale symmetrical and asymmetrical temporal profiles, capable of fine-tuning complex space-charge dynamics and external field effects in relativistic charged-particle beams. Here, we demonstrate that rather than deviations from theorized, idealized laser distributions, a controlled asymmetry can be harnessed to counteract accelerator-induced distortions. By implementing spatiotemporal shaping of the ultraviolet photocathode laser at the LCLS-II superconducting injector, we achieve deterministic control over the longitudinal phase space without downstream corrections. We find that this optical asymmetry induces a self-linearizing effect across both low (40 pC) and high (80 pC) charge regimes, effectively suppressing nonlinear compression and energy chirp. Consequently, this approach is expected to preserve a low emittance comparable to that of ideal flattop or regular Gaussian profiles, while delivering superior current uniformity and shot-to-shot stability. These results establish spatiotemporal laser shaping as a compact, generalizable tool for directly optimizing beam brightness at the source. |
| title | Upstream Laser-based Longitudinal Enhancement of Relativistic Photoelectrons |
| topic | Optics High Energy Physics - Experiment Applied Physics |
| url | https://arxiv.org/abs/2601.03580 |