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Area of Science:

  • High-energy physics
  • Plasma physics
  • Quantum electrodynamics (QED)

Background:

  • Ultraintense lasers interacting with solids generate electron-positron pairs via quantum electrodynamics (QED) processes.
  • The competition between linear and nonlinear Breit-Wheeler (BW) mechanisms for pair production in plasma environments requires further investigation.

Purpose of the Study:

  • To self-consistently investigate both linear and nonlinear BW pair production mechanisms in ultraintense laser-solid interactions.
  • To implement a Monte Carlo algorithm for the linear BW process into a QED particle-in-cell (PIC) code.

Main Methods:

  • Development and integration of a Monte Carlo algorithm for linear Breit-Wheeler (BW) process into the QED particle-in-cell (PIC) code yunic.
  • Conducting two-dimensional QED-PIC simulations of linearly polarized laser interactions with solid targets at varying laser intensities.
  • Analysis of the transition between linear and nonlinear BW processes as a function of laser intensity and preplasma scale lengths.

Main Results:

  • Observed a transition from linear to nonlinear Breit-Wheeler (BW) pair production with increasing laser intensity.
  • Identified a critical normalized laser amplitude (a₀∼400-500) below which the linear BW process dominates.
  • Demonstrated the dominance of the linear BW process over a wide range of preplasma scale lengths.

Conclusions:

  • The study provides a practical method for modeling linear QED processes using integrated QED-PIC simulations.
  • Linear Breit-Wheeler (BW) pair production is significant and warrants increased attention in upcoming 10-PW-class laser-solid interaction experiments.
  • Understanding the interplay between linear and nonlinear BW processes is crucial for predicting and controlling pair production in extreme laser-plasma environments.