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T: Fachverband Teilchenphysik

T 38: Methods of astroparticle physics II

T 38.6: Vortrag

Dienstag, 31. März 2020, 18:15–18:30, L-3.001

Ultra-fast ray tracing for the Wavelength-shifting Optical Module — •Florian Thomas, John Rack-Helleis, Sebastian Böser, and Elmar Schömer — Johannes Gutenberg-Universität Mainz

The Wavelength-shifting Optical Module (WOM) is a novel UV-sensitive light sensor for neutrino experiments. It consists of a cylindrical tube coated with wavelength shifting paint, light concentrators and photomultiplier tubes (PMTs). UV light striking the surface of the tube is absorbed, shifted towards longer wavelengths and guided to the PMT by total internal reflection. The simulation models the photon propagation within the tube wall and light concentrator and includes the simulation of photon interactions with the tube material, such as scattering and absorption. The simulation algorithm is based on a ray tracing approach and has been implemented for CUDA-enabled GPUs. It reaches a throughput of several million photons per second, which is three orders of magnitude faster than previous attempts using commercial software. The excellent simulation performance enabled the application in a fit to experimental data.