High brightness, symmetric electron bunch generation in a plasma wakefield accelerator via a radially-polarized plasma photocathode
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866915555968024576 |
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| author | Chappell, James Archer, Emily Walczak, Roman Hooker, Simon |
| author_facet | Chappell, James Archer, Emily Walczak, Roman Hooker, Simon |
| contents | The plasma photocathode has previously been proposed as a source of ultra-high-brightness electron bunches within plasma accelerators. Here, the scheme is extended by using a radially-polarized ionizing laser pulse to generate high-charge, high-brightness electron bunches with symmetric transverse emittance. Efficient start-to-end modelling of the scheme, from ionization and trapping until drive bunch depletion, enables a multi-objective Bayesian optimisation routine to be performed to understand the performance of the radially-polarized plasma photocathode, quantify the stability of the scheme, and explore the fundamental relation between the witness bunch charge and its emittance. Comparison of plasma photocathodes driven by radially- and linearly-polarized laser pulses show that the former yields higher brightness electron bunches when operating in the optimally-loaded regime. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_11387 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | High brightness, symmetric electron bunch generation in a plasma wakefield accelerator via a radially-polarized plasma photocathode Chappell, James Archer, Emily Walczak, Roman Hooker, Simon Accelerator Physics Plasma Physics The plasma photocathode has previously been proposed as a source of ultra-high-brightness electron bunches within plasma accelerators. Here, the scheme is extended by using a radially-polarized ionizing laser pulse to generate high-charge, high-brightness electron bunches with symmetric transverse emittance. Efficient start-to-end modelling of the scheme, from ionization and trapping until drive bunch depletion, enables a multi-objective Bayesian optimisation routine to be performed to understand the performance of the radially-polarized plasma photocathode, quantify the stability of the scheme, and explore the fundamental relation between the witness bunch charge and its emittance. Comparison of plasma photocathodes driven by radially- and linearly-polarized laser pulses show that the former yields higher brightness electron bunches when operating in the optimally-loaded regime. |
| title | High brightness, symmetric electron bunch generation in a plasma wakefield accelerator via a radially-polarized plasma photocathode |
| topic | Accelerator Physics Plasma Physics |
| url | https://arxiv.org/abs/2505.11387 |