Relativistic electrons from vacuum laser acceleration using tightly focused radially polarized beams
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arXiv
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| Hauptverfasser: | , , , , , , , , , |
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| Format: | Preprint |
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2024
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| author | Powell, Jeffrey Jolly, Spencer W. Vallières, Simon Fillion-Gourdeau, François Payeur, Stéphane Fourmaux, Sylvain Piché, Michel Ibrahim, Heide MacLean, Steve Légaré, François |
| author_facet | Powell, Jeffrey Jolly, Spencer W. Vallières, Simon Fillion-Gourdeau, François Payeur, Stéphane Fourmaux, Sylvain Piché, Michel Ibrahim, Heide MacLean, Steve Légaré, François |
| contents | We generate a tabletop pulsed relativistic electron beam at 100 Hz repetition rate from vacuum laser acceleration (VLA) by tightly focusing a radially polarized beam into a low-density gas. We demonstrate that strong longitudinal electric fields at the focus can accelerate electrons up to 1.43 MeV by using only 98 GW of peak laser power. The electron energy is measured as a function of laser intensity and gas species, revealing a strong dependence on the atomic ionization dynamics. These experimental results are supported by numerical simulations of particle dynamics in a tightly focused configuration that take ionization into consideration. For the range of intensities considered, it is demonstrated that atoms with higher atomic numbers like krypton can optimally inject electrons at the peak of the laser field, resulting in higher energies and an efficient acceleration mechanism that reaches a significant fraction of the theoretical energy gain limit. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_08009 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Relativistic electrons from vacuum laser acceleration using tightly focused radially polarized beams Powell, Jeffrey Jolly, Spencer W. Vallières, Simon Fillion-Gourdeau, François Payeur, Stéphane Fourmaux, Sylvain Piché, Michel Ibrahim, Heide MacLean, Steve Légaré, François Optics Accelerator Physics Atomic Physics We generate a tabletop pulsed relativistic electron beam at 100 Hz repetition rate from vacuum laser acceleration (VLA) by tightly focusing a radially polarized beam into a low-density gas. We demonstrate that strong longitudinal electric fields at the focus can accelerate electrons up to 1.43 MeV by using only 98 GW of peak laser power. The electron energy is measured as a function of laser intensity and gas species, revealing a strong dependence on the atomic ionization dynamics. These experimental results are supported by numerical simulations of particle dynamics in a tightly focused configuration that take ionization into consideration. For the range of intensities considered, it is demonstrated that atoms with higher atomic numbers like krypton can optimally inject electrons at the peak of the laser field, resulting in higher energies and an efficient acceleration mechanism that reaches a significant fraction of the theoretical energy gain limit. |
| title | Relativistic electrons from vacuum laser acceleration using tightly focused radially polarized beams |
| topic | Optics Accelerator Physics Atomic Physics |
| url | https://arxiv.org/abs/2402.08009 |