Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 7: Direkte Suche nach Dunkler Materie I

T 7.4: Talk

Monday, March 25, 2019, 16:50–17:05, H09

Cu-pins as a novel tool to counteract PTFE surface charges in DARWIN — •Tobias Kleiner — KIT (IKP), Karlsruhe, Germany

The goal of the DARWIN experiment is to design and construct the ultimate dark matter detector, using a multi-ton target of liquid xenon for the direct detection of particle dark matter in a sensitive time projection chamber. Together with achieving very low radioactivity conditions and the required xenon purity, one of the most challenging aspects is the ability to have a very homogeneous drift field inside the TPC with ideally no radial electrical field. It is therefore crucial to investigate surface charge-up effects of the reflection enhancing PTFE wall observed in preceding experiments like LUX, as well as identifying a method to reduce its influence on the electric field. We experimentally investigate the novel ansatz to collect PTFE surface charges by Cu-pins. Surface charges are generated by an electron gun as well as by UV light with and without Cu-pins, and the resulting electric field is measured by a movable electrostatic voltmeter.