Dortmund 2021 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 72: Experimental techniques in astroparticle physics III
T 72.3: Vortrag
Mittwoch, 17. März 2021, 16:30–16:45, Tv
Measuring xenon scintillation light transmission through PTFE — •Dominick Cichon1, Guillaume Eurin1,2, Florian Jörg1, Teresa Marrodán Undagoitia1, and Natascha Rupp1 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2IRFU, CEA/Saclay, France
Xenon has proven itself to be a well-suited target material to be used in detectors searching for rare events predicted by new physics. This is because of its properties, which include a high stopping power and the availability of both scintillation and charge signal channels. The latter allows for effective particle discrimination.
Detectors which utilize liquid xenon (LXe), such as LXe time projection chambers (TPCs), commonly use polytetrafluoroethylene (PTFE) to maximize the collection of scintillation photons and to optically decouple the intended sensitive volume from other detector regions. The reason is PTFE's high reflectivity at xenon's peak emission wavelength.
For rare event searches, the amount of PTFE used for the purposes mentioned above should be as small as possible in order to reduce the material budget and the accompanying radiogenic background. Furthermore, some detector applications necessitate the attenuation of the scintillation signal because of photosensor constraints. Motivated by these considerations, this talk presents measurements of the transmittance of PTFE for xenon scintillation light, both in gaseous and in liquid xenon. The results can be applied to estimate the amount of PTFE needed for optical decoupling and to construct xenon scintillation light attenuators made out of PTFE.