Bulletin of the American Physical Society
63rd Annual Meeting of the APS Division of Plasma Physics
Volume 66, Number 13
Monday–Friday, November 8–12, 2021; Pittsburgh, PA
Session BP11: Poster Session I:
BEAMS - Coherent radiation and intense laser-driven x-ray sources; Laser-plasma ion accelerators; Relativistic high-energy-density physics and high field physics
MFE - Low Aspect Ratio Tokamaks
9:30 AM - 12:30 PM
Monday, November 8, 2021
Room: Hall A
Abstract: BP11.00050 : Extreme Gamma-Ray Flash in the λ3 Regime
Presenter:
Prokopis Hadjisolomou
Authors:
Prokopis Hadjisolomou
Tae Moon Jeong
(ELI Beamlines)
Petr Valenta
(ELI Beamlines)
David Kolenaty
(ELI Beamlines)
Roberto Versaci
(ELI Beamlines)
Veronika Olsovcova
(ELI Beamlines)
Christopher P Ridgers
(University of York)
Sergei V Bulanov
(ELI Beamlines)
lasers can provide the ultralelativistic intensities needed to study the collective behaviour of
γ-photons and electron-positron pairs. These ultralelativistic intensities can be achieved by focusing
down the laser beam to the sub-wavelength limit. In the past, a preplasma was found to
increase the g-photon energy conversion efficiency [1, 2]. In the present work, we employ three
dimensional quantum electrodynamic [3] particle in cell simulations where a single-cycle pulse
is focused by an 1/3 f-number parabola to a spherical-like field, in the so-called λ3 regime
[4]. The field interacts with a steep gradient foil target, resulting in a laser to γ-photon energy
conversion efficiency of almost 50 % at a laser intensity of 1025 W cm−2. A multiparametric
study on the target thickness and electron number density is performed. In addition, the dependency
on the laser polarisation is studied, revealing that a radially polarised laser is beneficial
on γ-photon generation compared to both linearly and azimuthally polarised lasers. The effect
of altering the laser power in the range 1−300 PW is also studied, revealing a region where a
prolific electron-positron pair generation happens, while γ-photon energy conversion efficiency
saturates. Finally, further interactions of the γ-photon flash with high-Z materials is studied by
the use of Mote-Carlo simulations.
References:
[1] T. Nakamura et al., Phys. Re. Lett. 108, 195001 (2012)
[2] K. V. Lezhnin et al., Phys. Plasmas 25, 123105 (2018)
[3] C. P. Ridgers et al., Phys. Rev. Lett. 108, 165006 (2012)
[4] G. Mourou et al., Plasma Phys. Rep. 28, 12 (2002)
[5] P. Hadjisolomou et al., Phys. Rev. E 104, 015203 (2021)
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