Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 32: Methods in astroparticle physics 2

T 32.8: Talk

Tuesday, March 5, 2024, 17:45–18:00, Geb. 20.30: 2.067

Wavelength shifting fibers with high photon capture rate — Bastian Keßler, John Rack-Helleis, and •Sebastian Böser — JGU Mainz - Institut für Physik

Wavelength-shifting optical fibers are commonly used to collect light from large detector volumes and guide towards photosensors, which makes them particularly interesting for water Cherenkov or scintillator based detectors. However, one problem is their low photon capture rate, leading to a reduction in the energy resolution of fiber-based detectors.

Building on previous work, it was shown that the photon capture rate can be increased by appropriate design of the photon absorption zone. In this work, this concept was applied to wavelength shifting fiber, and the capture rate and absorption mechanism were studied in detail. It was found that initially the attenuation is mainly driven by self-absorption on the wavelength-shifting molecules themselves.

Here we present data from several measurement campaigns to quantify the self-absorbance together with an updated attenuation model.

Keywords: wavelength shifting fibers