Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 23: Experimental Techniques in Astroparticle Physics 1
T 23.6: Vortrag
Montag, 21. März 2022, 17:30–17:45, T-H36
Timing characteristics of the Wavelength-shifting Optical Module — •John Rack-Helleis1, Sebastian Böser1, Martin Rongen1, Klaus Helbing2, Anna Pollmann2, Nick Schmeißer2, Yuriy Popovych1, and Kyra Mossel1 for the IceCube collaboration — 1Johannes Gutenberg Universität Mainz — 2Bergische Universität Wuppertal
The Wavelength-shifting Optical Module (WOM) uses the techniques of wavelength shifting and light guiding to achieve a large photosensitive area, UV-sensitivity and improved signal-to-noise ratio. The centerpiece of the sen- sor is a hollow quartz cylinder coated with wavelength-shifting paint with a PMT (Photomultiplier Tube) optically coupled to each of its ends. Incident photons are absorbed, wavelength shifted and re-emitted into the tube walls. From there, they are guided towards one of the read out PMTs via total inter- nal reflection. While effective area and signal-to-noise ratio scale approximately linearly with the cylinder length, the average time it takes photons to reach one of the readout PMTs also increases. The timing of the WOM can be described by a convolution of three main components: The time response of the attached read out PMT, the photoluminescence characteristics of the WLS paint, and the path length distribution of photons inside the WLS tube. In this presentation we elaborate on the understanding of the timing of the WOM from a theoretical and experimental stand point. We present the intricacies of a device where everything seemingly runs in circles.