Collimated γ-ray emission enabled by efficient direct laser acceleration

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Collimated γ-ray emission enabled by efficient direct laser acceleration

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Collimated γ-ray emission enabled by efficient direct laser acceleration

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10300 - Physical sciences

Projekt

<a href="/cs/project/GF22-42890L" target="_blank" >GF22-42890L: Studium generace záření gama doprovázejícího interakci plazmatu s laserem o vysoké intenzitě na ELI Beamlines</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

NEW JOURNAL OF PHYSICS

ISSN

1367-2630

e-ISSN

—

Svazek periodika

27

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

28

Strana od-do

023024 (21 -28)

Kód UT WoS článku

001423408700001

EID výsledku v databázi Scopus

2-s2.0-85217902670