Speaker
Description
Opticks is an open source project that accelerates optical photon simulation
by integrating NVIDIA GPU ray tracing, accessed via the NVIDIA OptiX API, with
Geant4 toolkit based simulations.
Optical photon simulation times of 14 seconds per 100 million photons
have been measured within a fully analytic JUNO GPU geometry
auto-translated from the Geant4 geometry when using a single NVIDIA GPU from
the first RTX generation.
Optical physics processes of scattering, absorption, scintillator reemission
and boundary processes are implemented in CUDA based on Geant4. Wavelength-dependent material and surface
properties as well as inverse cumulative distribution functions for reemission
are interleaved into GPU textures providing fast interpolated property lookup
or wavelength generation. In this work we describe the application of Opticks
to JUNO simulation including new Opticks features that improve performance for
complex CSG shapes and torus solids.
