Electron - positron cascades in multiple-laser optical traps

Abstract

We present an analytical and numerical study of multiple-laser QED cascades induced with linearly polarised laser pulses. We analyse different polarisation orientations and propose a configuration that maximises the cascade multiplicity and favours the laser absorption. We generalise the analytical estimate for the cascade growth rate previously calculated in the field of two colliding linearly polarised laser pulses and account for multiple laser interaction. The estimate is verified by a comprehensive numerical study of four-laser QED cascades across a range of different laser intensities with QED PIC module of OSIRIS. We show that by using four linearly polarised 30 fs laser pulses, one can convert more than 50 % of the total energy to gamma-rays already at laser intensity $I\simeq 10^{24}W/c{\mathrm{m}}^2$. In this configuration, the laser conversion efficiency is higher compared with the case with two colliding lasers.

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• Gamma-Ray Flash in the Interaction of a Tightly Focused Single-Cycle Ultraintense Laser Pulse with a Solid Target
• Particle dynamics and spatial $e^{-}{e}^{+}$ density structures at QED cascading in circularly polarized standing waves
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• Particle trajectories, gamma-ray emission, and anomalous radiative trapping effects in magnetic dipole wave
• Effects of colliding laser pulses polarization on $e^{-}{e}^{+}$ cascade development in extreme focusing
• Seed and vacuum pair production in strong laser field
• Attosecond gamma-ray flashes and electron-positron pairs in dyadic laser interaction with micro-wire
• Optimized computation of tight focusing of short pulses using mapping to periodic space
• Collimated $\gamma$-flash emission along the target surface irradiated by a laser at non-grazing incidence
• Towards Modelling AR Sco: Calibration -- Reproducing High-Energy Pulsar Emission and Testing Convergence to Aristotelian Electrodynamics
• Optimal laser focusing for positron production in laser-electron scattering
• QED Effects at Grazing Incidence on Solid-State-Targets