Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 38: Methods of astroparticle physics II

T 38.2: Talk

Tuesday, March 31, 2020, 17:15–17:30, L-3.001

Development of a Wavelength-shifting Optical Module for STRAW-b — •Maximilian Bubeck, Lucas Sebastian Binn, John Rack-Helleis, Anna Vocke geb. Steuer, Sebastian Böser, Lutz Köpke, and Diego Salgado Llamas — JGU Mainz

The Wavelength-shifting Optical Module (WOM) is a photosensor that detects UV light with a very high signal-to-noise ratio. The WOM consists of a quartz-glass tube coated with a wavelength-shifting paint, which absorbs light in the UV range and re-emits it in the visible spectrum. Two photo-multiplier tubes (PMTs) attached to the ends of the light-guiding tube detect the shifted photons. We are currently assembling a prototype that will soon be deployed in STRAW-b, an experiment in the Cascadia Basin at a depth of 2600 m, to measure the noise rate in a deep sea environment. Designed to withstand extreme pressures, the WOM is surrounded by a pressure housing. To reduce photon losses, the space between the pressure vessel and the inner tube is filled with hydrogel, which offers a similar refractive index as water. The PMTs are optically and mechanically connected to the inner tube using UV-curing adhesive. To fulfill the requirements for a deployment in the deep sea, the final WOM will need to pass multiple vibration and pressure tests.