Enhancement of J x B electron acceleration with the micro-structured target and picosecond high-contrast relativistic-intensity laser pulse Article Swipe
Yuga Karaki
,
Hiroki Matsubara
,
Rinya Akematsu
,
Ryou Oomura
,
H. Azechi
,
T. Johzaki
,
Y. Sentoku
,
Shinsuke Fujioka
·
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.48550/arxiv.2506.21847
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.48550/arxiv.2506.21847
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.
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Metadata
- Type
- preprint
- Language
- en
- Landing Page
- http://arxiv.org/abs/2506.21847
- https://arxiv.org/pdf/2506.21847
- OA Status
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All OpenAlex metadata
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Enhancement of J x B electron acceleration with the micro-structured target and picosecond high-contrast relativistic-intensity laser pulseWork title
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preprintOpenAlex work type
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enPrimary language
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2025Year of publication
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2025-06-27Full publication date if available
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Yuga Karaki, Hiroki Matsubara, Rinya Akematsu, Ryou Oomura, H. Azechi, T. Johzaki, Y. Sentoku, Shinsuke FujiokaList of authors in order
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https://arxiv.org/abs/2506.21847Publisher landing page
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https://arxiv.org/pdf/2506.21847Direct link to full text PDF
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greenOpen access status per OpenAlex
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https://arxiv.org/pdf/2506.21847Direct OA link when available
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0Total citation count in OpenAlex
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