Lampray: Multi-group long characteristics ray tracing for adaptive mesh radiation hydrodynamics

Understand

We present Lampray: a multi-group long characteristics ray tracing method for adaptive mesh radiation hydrodynamics in the Ramses code.

• It avoids diffusion, captures shadows, and treats colliding beams correctly, and therefore complements existing moment-based ray tracing in Ramses.
• Lampray includes different options for interpolation between ray and cell domain, and use either integral, Fourier, or an implicit method for hydrogen ionization to solve the radiative transfer.
• The opacity can either be tabulated or computed through a coupling to the general non-equilibrium astro-chemistry framework Krome.