Aachen 2019 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 31: Direkte Suche nach Dunkler Materie II

T 31.8: Vortrag

Dienstag, 26. März 2019, 17:45–18:00, H09

Proportional Scintillation in liquid xenon — •Patrick Meinhardt — Physikalisches Institut, Hermann-Herder-Straße 3, 79104, Freiburg

Time Projection Chambers (TPCs) filled with liquid xenon are currently leading direct search for WIMP dark matter. The experiments detect a scintillation signal (S1) produced instantaneously by the interacting particle and a time-delayed charge signal (S2). In the commonly used dual-phase TPC, the charge signal is amplified by extracting the ionization electrons into the gas phase above the liquid target where they create a secondary scintillation signal which is proportional to the charge. Scaling this concept to the scale of the ultimate dark matter detector DARWIN leads to challenges regarding mechanics and operation which could be overcome by a paradigm shift towards a single-phase TPC. Here, the proportional scintillation signal S2 is produced in the liquid phase, in the strong electric field around very thin wires. Changing the amplification mechanism also provides the opportunity to reduce detector artefacts observed in dual-phase TPCs and could potentially improve the ER/NR discrimination power. We report on our studies to generate S2 signals in liquid xenon using the XEBRA test platform in Freiburg.