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Accurate modelling is necessary to support precision experimentsinvestigating strong-field QED phenomena. This modelling is particularlychallenging in the transition between the perturbative and nonperturbativeregimes, where the normalized laser amplitude $a_0$ is comparable to unity andwavelength-scale interference is significant. Here we describe how to simulatenonlinear Compton scattering, Breit-Wheeler pair creation, and trident paircreation in this regime, using the Monte Carlo particle-tracking codePtarmigan. This code simulates collisions between high-intensity lasers andbeams of electrons or $\gamma$ rays, primarily in the framework of the locallymonochromatic approximation (LMA). We benchmark our simulation results againstfull QED calculations for pulsed plane waves and show that they are accurate atthe level of a few per cent, across the full range of particle energies andlaser intensities. This work extends our previous results to linearly polarizedlasers and arbitrarily polarized $\gamma$ rays.

Simulations of laser-driven strong-field QED with Ptarmigan: Resolving wavelength-scale interference and $\gamma$-ray polarization