Collimated γ-ray emission enabled by efficient direct laser acceleration

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F10974938%3A_____%2F25%3A25_89_02" target="_blank" >RIV/10974938:_____/25:25_89_02 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1088/1367-2630/adb3c1" target="_blank" >https://doi.org/10.1088/1367-2630/adb3c1</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1367-2630/adb3c1" target="_blank" >10.1088/1367-2630/adb3c1</a>

Result language
angličtina
Original language name
Collimated γ-ray emission enabled by efficient direct laser acceleration
Original language description
We investigate the mechanisms responsible for single-lobed versus double-lobed angular distributions of emitted gamma-rays in laser-irradiated plasmas, focusing on how direct laser acceleration (DLA) shapes the emission profile. Using test-particle calculations, we show that the efficiency of DLA plays a central role. In the inefficient DLA regime, electrons rapidly gain and lose energy within a single laser cycle, resulting in a double-lobed emission profile heavily influenced by laser fields. In contrast, in the efficient DLA regime, electrons steadily accumulate energy over multiple laser cycles, achieving much higher energies and emitting orders of magnitude more energy. This emission is intensely collimated and results in single-lobed profiles dominated by quasi-static azimuthal magnetic fields in the plasma. Particle-in-cell simulations demonstrate that lower-density targets create favorable conditions for some electrons to enter the efficient DLA regime. These electrons can dominate the emission, transforming the overall profile from double-lobed to single-lobed, even though inefficient DLA electrons remain present. These findings provide valuable insights for optimizing laser-driven gamma-ray sources for applications requiring high-intensity, well-collimated beams.
Czech name
—
Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10300 - Physical sciences

Project
<a href="/en/project/GF22-42890L" target="_blank" >GF22-42890L: Study of gamma-ray generation in high-intensity laser-plasma interactions at ELI Beamlines</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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