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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2603.27692 |
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| _version_ | 1866914450145017856 |
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| author | Matheron, Aimé Storey, Doug Gilljohann, Max F. Rego, Sheldon Adli, Erik Andriyash, Igor A. Cao, Gevy J. Davoine, Xavier Emma, Claudio Fiuza, Frederico Gessner, Spencer Gremillet, Laurent Hansel, Claire Joshi, Chan Keitel, Christoph H. Knetsch, Alexander Lee, Valentina Litos, Michael D. Majernik, Nathan Mankovska, Yuliia O'Shea, Brendan Rajkovic, Ivan Claveria, Pablo San Miguel Zakharova, Viktoriia Zhang, Chaojie Hogan, Mark J. Tamburini, Matteo Corde, Sébastien |
| author_facet | Matheron, Aimé Storey, Doug Gilljohann, Max F. Rego, Sheldon Adli, Erik Andriyash, Igor A. Cao, Gevy J. Davoine, Xavier Emma, Claudio Fiuza, Frederico Gessner, Spencer Gremillet, Laurent Hansel, Claire Joshi, Chan Keitel, Christoph H. Knetsch, Alexander Lee, Valentina Litos, Michael D. Majernik, Nathan Mankovska, Yuliia O'Shea, Brendan Rajkovic, Ivan Claveria, Pablo San Miguel Zakharova, Viktoriia Zhang, Chaojie Hogan, Mark J. Tamburini, Matteo Corde, Sébastien |
| contents | Extreme beams of charged particles and photons, reaching ultrahigh densities or producing intense gamma-ray bursts, are central to accelerator physics, laboratory astrophysics, and strong-field quantum electrodynamics research. Yet their generation is hindered by conventional focusing methods at multi-GeV energies that rely on massive magnetic assemblies, limiting compactness and attainable density. Here we report the first experimental observation of a fundamentally new focusing mechanism, in which a high-energy charged-particle beam is focused by its own magnetic field reflected from a stack of thin metallic foils via near-field coherent-transition-radiation. The experiment, performed at SLAC's FACET-II facility, reveals strong, cumulative focusing across a broad range of beam configurations, enabled by the delivered 10 GeV, 1 nC, 10 Hz electron beam. The measurements closely agree with predictions from an analytical model and particle-in-cell simulations. These results demonstrate that multifoil focusing is a remarkably straightforward, self-aligned approach to the generation of ultrahigh density beams, opening a path to explore unprecedented regimes of beam-matter interaction and high-energy radiation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_27692 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Strong-field focusing of high-energy particles in beam-multifoil collisions Matheron, Aimé Storey, Doug Gilljohann, Max F. Rego, Sheldon Adli, Erik Andriyash, Igor A. Cao, Gevy J. Davoine, Xavier Emma, Claudio Fiuza, Frederico Gessner, Spencer Gremillet, Laurent Hansel, Claire Joshi, Chan Keitel, Christoph H. Knetsch, Alexander Lee, Valentina Litos, Michael D. Majernik, Nathan Mankovska, Yuliia O'Shea, Brendan Rajkovic, Ivan Claveria, Pablo San Miguel Zakharova, Viktoriia Zhang, Chaojie Hogan, Mark J. Tamburini, Matteo Corde, Sébastien Accelerator Physics Plasma Physics Extreme beams of charged particles and photons, reaching ultrahigh densities or producing intense gamma-ray bursts, are central to accelerator physics, laboratory astrophysics, and strong-field quantum electrodynamics research. Yet their generation is hindered by conventional focusing methods at multi-GeV energies that rely on massive magnetic assemblies, limiting compactness and attainable density. Here we report the first experimental observation of a fundamentally new focusing mechanism, in which a high-energy charged-particle beam is focused by its own magnetic field reflected from a stack of thin metallic foils via near-field coherent-transition-radiation. The experiment, performed at SLAC's FACET-II facility, reveals strong, cumulative focusing across a broad range of beam configurations, enabled by the delivered 10 GeV, 1 nC, 10 Hz electron beam. The measurements closely agree with predictions from an analytical model and particle-in-cell simulations. These results demonstrate that multifoil focusing is a remarkably straightforward, self-aligned approach to the generation of ultrahigh density beams, opening a path to explore unprecedented regimes of beam-matter interaction and high-energy radiation. |
| title | Strong-field focusing of high-energy particles in beam-multifoil collisions |
| topic | Accelerator Physics Plasma Physics |
| url | https://arxiv.org/abs/2603.27692 |