Göttingen 2012 – scientific programme

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T: Fachverband Teilchenphysik

T 112: Niederenergie-Neutrinophysik/Suche nach Dunkler Materie 7

T 112.5: Talk

Thursday, March 1, 2012, 17:50–18:05, ZHG 102

Design of a two-phase Xenon TPC for the study of fast scintillation in LXe dark matter detectors — •Bastian Beskers, Cyril Grignon, Uwe Oberlack, Rainer Othegraven, and Pierre Sissol — Johannes Gutenberg Universität Mainz

XENON100 is currently the most sensitive dark matter search experiment, its successor XENON1T is already in development phase. Dark Matter detectors at the 10 ton scale (e.g. DARWIN) are being envisioned. These experiments are based on dual-phase Xenon time projection chambers. Background suppression and discrimination are driving forces in the design of these experiments. Currently this is accomplished by fiducialization using position sensitivity and light/charge discrimination. Additional discrimination may be achieved by pulse-shape discrimination.
The Mainz group is setting up a small two-phase Xenon-TPC to measure charge and scintillation yield at recoil energies in the order of few keV and to study the liquid Xenon scintillation pulse shape. As new features compared to former scintillation/charge yield experiments, our TPC will have 3D position resolution and very fast readout electronics (sampling rate 2.5 GS/s). Position resolution will be used to fiducialize the active volume, select single scatters and to reduce systematic errors.
This talk gives an overview on motivation of planned measurements, the simulations done to optimize the design of the TPC and the current state of the experiment.