Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 9: Neutrinophysik IX

T 9.4: Talk

Monday, March 19, 2018, 16:45–17:00, Z6 - HS 0.002

Cavity enhanced long light path attenuation length measurement — •Tobias Heinz, Tobias Lachenmaier, David Blum, Alexander Tietzsch, Axel Müller, Tobias Sterr, and Marc Breisch — Physikalisches Institut, Universität Tübingen

In large liquid scintillator detectors like the JUNO detector a high optical transparency for the produced scintillation light is one of the key requirements for the detector material. To quantify the optical transparency a measurement of the attenuation length is crucial.

The required attenuation length for the liquid scintillator used in the JUNO detector should be greater than 22 m @ 430 nm. The measurement of such a high value is difficult with commercial UV-VIS spectrometers due to the shortness of commonly used absorption cells and the corresponding small decrease in light intensity. This talk will present an alternative method to measure the attenuation length of liquid scintillators using an optical cavity to extend the effective light path through the medium and therefore increases the precision of the attenuation measurement. The current status of the experimental setup and some first results will be presented.

This work is supported by the Deutsche Forschungsgemeinschaft.