# Brilliant GeV Gamma-ray flash from Inverse Compton Scattering in QED Regime

## TL;DR

This paper proposes a novel all-optical scheme to generate ultra-bright, multi-petawatt gamma-ray flashes via inverse Compton scattering in the QED regime, supported by theoretical modeling and 3D PIC simulations.

## Contribution

It introduces a new theoretical model explaining the coupling effects in laser-plasma interactions and demonstrates unprecedented gamma-ray flash power and brightness through simulations.

## Key findings

- Gamma-ray flash power reaches multi-petawatt levels.
- Brightness of gamma-ray emission is 1.7×10^{23} photons/s/mm^2/mrad^2/0.1% bandwidth.
- Theoretical model explains energy and angular momentum transfer in QED regime.

## Abstract

An all-optical scheme is proposed for studying a laser-plasma based incoherent photon emission from inverse Compton scattering in quantum electrodynamic (QED) regime. A theoretical model is presented to explain the coupling effect among radiation reaction trapping, self-generated magnetic field and spiral attractor in phase space, which guarantees the energy and angular momentum (AM) transformation from electromagnetic fields to particles. Taking advantage of a prospective $\sim$10$^{23}$W/cm$^{2}$ laser facility, 3D Particle-in-cell (PIC) simulations manifest the present gamma-ray flash with an unprecedented power of multi-petawatt (PW) and brightness of 1.7$\times$10$^{23}$photons/s/mm$^2$/mrad$^2$/0.1$\%$bandwidth (at 1GeV). These results bode well for new research direction in particle physics and laboratory astrophysics while exploring laser plasma interaction.