Enhancement of J x B electron acceleration with the micro-structured target and picosecond high-contrast relativistic-intensity laser pulse
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arXiv
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| Autori principali: | , , , , , , , , , , |
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| Natura: | Preprint |
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2025
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| _version_ | 1866909661885628416 |
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| author | Takizawa, Ryunosuke Karaki, Yuga Matsubara, Hiroki Akematsu, Rinya Oomura, Ryou Farley, Law King Fai Azechi, Hiroshi Iwata, Natsumi Johzaki, Tomoyuki Sentoku, Yasuhiko Fujioka, Shinsuke |
| author_facet | Takizawa, Ryunosuke Karaki, Yuga Matsubara, Hiroki Akematsu, Rinya Oomura, Ryou Farley, Law King Fai Azechi, Hiroshi Iwata, Natsumi Johzaki, Tomoyuki Sentoku, Yasuhiko Fujioka, Shinsuke |
| contents | Efficient generation of multi-hundred-keV electrons is essential for isochoric heating and can influence ion acceleration. We investigated electron acceleration from copper-oleate foil targets, either planar or coated with a gold mesh structure (bar width $5,μ\mathrm{m}$, spacing $7.5,μ\mathrm{m}$, thickness $\sim6,μ\mathrm{m}$), irradiated by $1.5$-ps, $350$-J LFEX laser pulses. Two laser-contrast conditions were examined: high ($\sim10^{10}$, with a plasma mirror) and low ($\sim10^{8}$, without a plasma mirror). Using Cu-K$_α$ emission mapping, we found that under high-contrast irradiation the micro-structured target enhanced the laser-to-electron conversion efficiency from $4.9\%$ to $14\%$, attributed to multiple internal reflections that strengthen $J\times B$ acceleration. In contrast, under low-contrast conditions the structures were filled with pre-plasma before the main pulse, and no enhancement was observed. These results demonstrate that both fine-scale structuring and high contrast are crucial for maximizing $J\times B$-driven electron generation in laser-plasma interactions. Our findings suggest a practical approach to improving laser-plasma coupling efficiency by exploiting micro-structured surfaces and contrast-controlled irradiation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_21847 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Enhancement of J x B electron acceleration with the micro-structured target and picosecond high-contrast relativistic-intensity laser pulse Takizawa, Ryunosuke Karaki, Yuga Matsubara, Hiroki Akematsu, Rinya Oomura, Ryou Farley, Law King Fai Azechi, Hiroshi Iwata, Natsumi Johzaki, Tomoyuki Sentoku, Yasuhiko Fujioka, Shinsuke Plasma Physics Efficient generation of multi-hundred-keV electrons is essential for isochoric heating and can influence ion acceleration. We investigated electron acceleration from copper-oleate foil targets, either planar or coated with a gold mesh structure (bar width $5,μ\mathrm{m}$, spacing $7.5,μ\mathrm{m}$, thickness $\sim6,μ\mathrm{m}$), irradiated by $1.5$-ps, $350$-J LFEX laser pulses. Two laser-contrast conditions were examined: high ($\sim10^{10}$, with a plasma mirror) and low ($\sim10^{8}$, without a plasma mirror). Using Cu-K$_α$ emission mapping, we found that under high-contrast irradiation the micro-structured target enhanced the laser-to-electron conversion efficiency from $4.9\%$ to $14\%$, attributed to multiple internal reflections that strengthen $J\times B$ acceleration. In contrast, under low-contrast conditions the structures were filled with pre-plasma before the main pulse, and no enhancement was observed. These results demonstrate that both fine-scale structuring and high contrast are crucial for maximizing $J\times B$-driven electron generation in laser-plasma interactions. Our findings suggest a practical approach to improving laser-plasma coupling efficiency by exploiting micro-structured surfaces and contrast-controlled irradiation. |
| title | Enhancement of J x B electron acceleration with the micro-structured target and picosecond high-contrast relativistic-intensity laser pulse |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2506.21847 |