Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 6: Methods in astroparticle physics 1

T 6.1: Talk

Monday, March 4, 2024, 16:00–16:15, Geb. 20.30: 2.067

Efficiency Measurements of the WOM for the IceCube Upgrade — •Philipp Kern, Sebastian Böser, Yuriy Popovych, John Rack-Helleis, and Bastian Kessler for the IceCube Collaboration collaboration — Institut für Physik, JGU Mainz, Deutschland

The IceCube Neutrino Observatory will undergo an Upgrade to increase its sensitivity to neutrino events. One type of Upgrade Module is the Wavelength-shifting Optical Module (WOM), which uses wavelength-shifting technology to detect UV-Cherenkov photons. The main component of the WOM is a quartz tube coated with wavelength-shifting paint. The absorbed and isotropically re-emitted photons are captured inside the tube by total internal reflection and propagate to both ends coupled to Photomultiplier Tubes for detection.

For the deployment in IceCube different properties of the wavelength-shifting tube, such as the attenuation length, the quality of the optical coupling and the paint homogeneity have to be characterized and an efficiency calibration has to be performed for the whole module. For this purpose a custom test stand was built to characterize the WOM, with the possibility to measure the whole surface of the tube over a large wavelength range. This procedure will be done with a single tube used and the complete built WOMs. Here we present results from the characterization and efforts to investigate systematic effects in them.

Keywords: Neutrino Detectors; photon detection; UV sensitivity; photomultiplier tubes