Phase-Space Shaping in Wakefield Accelerators due to Betatron Cooling
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| Format: | Preprint |
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2025
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| _version_ | 1866918176055361536 |
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| author | Bilbao, Pablo J. Silva, Thales Silva, Luis O. |
| author_facet | Bilbao, Pablo J. Silva, Thales Silva, Luis O. |
| contents | Plasma-based accelerators are beginning to employ relativistic beams with unprecedented charge and ultrashort durations. These dense driver beams can drive wakes even in high-density plasmas ($\gtrsim10^{19}$ cm$^{-3}$), where betatron radiation becomes increasingly important and begins to affect the dynamics of the accelerated beam. In this Letter, we show that betatron cooling leads to a strong, structuring of the phase space of the beam. This gives rise to bunched, ring-like structures with positive radial position and momentum gradients, \emph{i.e.}, population inversion of the amplitude of oscillation. We derive the characteristic timescales for this process analytically and confirm our predictions with multi-dimensional Particle-in-Cell simulations. The radiation-dominated regime of beam dynamics fundamentally alters the acceleration process and produces self-structured beams capable of triggering coherent betatron emission in ion channels. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_24567 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Phase-Space Shaping in Wakefield Accelerators due to Betatron Cooling Bilbao, Pablo J. Silva, Thales Silva, Luis O. Accelerator Physics Plasma Physics Plasma-based accelerators are beginning to employ relativistic beams with unprecedented charge and ultrashort durations. These dense driver beams can drive wakes even in high-density plasmas ($\gtrsim10^{19}$ cm$^{-3}$), where betatron radiation becomes increasingly important and begins to affect the dynamics of the accelerated beam. In this Letter, we show that betatron cooling leads to a strong, structuring of the phase space of the beam. This gives rise to bunched, ring-like structures with positive radial position and momentum gradients, \emph{i.e.}, population inversion of the amplitude of oscillation. We derive the characteristic timescales for this process analytically and confirm our predictions with multi-dimensional Particle-in-Cell simulations. The radiation-dominated regime of beam dynamics fundamentally alters the acceleration process and produces self-structured beams capable of triggering coherent betatron emission in ion channels. |
| title | Phase-Space Shaping in Wakefield Accelerators due to Betatron Cooling |
| topic | Accelerator Physics Plasma Physics |
| url | https://arxiv.org/abs/2510.24567 |