Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 7: Direkte Suche nach Dunkler Materie I

T 7.8: Talk

Monday, March 25, 2019, 17:50–18:05, H09

Surface cleaning for background reduction and its influence on liquid xenon TPC performance — •Natascha Rupp, Dominick Cichon, Guillaume Eurin, Florian Joerg, and Teresa Marrodan Undagoitia — Max-Planck-Institut fuer Kernphysik, Heidelberg

One main challenge in the direct detection of dark matter particles with liquid xenon TPCs (Time Projection Chambers) is the background reduction to a minimal rate. The plate-out of Rn222 daughters on the surfaces in contact with the liquid xenon can cause background events. We investigated different cleaning procedures that mitigate this background source. In order to apply them in future TPCs like DARWIN it has to be verified that they don't affect the xenon purity which strongly influences the signal production and hence the discrimination power of signal and background. This talk presents different cleaning procedures for PTFE and shows first results of the xenon purity evolution after applying them in a TPC.