Würzburg 2018 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 22: Poster
T 22.8: Poster
Montag, 19. März 2018, 16:00–18:30, Z6 - Foyer
Characterization of the XENON1T liquid xenon dual-phase time projection chamber using Kr-83m — •Michael Wigard — Institut für Kernphysik, WWU Münster
The XENON1T experiment aims to detect the interactions of weakly interacting massive particles (WIMPs) and xenon nuclei. With a projected sensitivity of 1.6 · 10−47 cm2 at 50 GeV after 2 ton-years exposure, it is the most sensitive dark matter direct detection experiment in the world, using the largest liquid xenon dual-phase time projection chamber in the world. The first dark matter search result with 34.2 live days has already been published, and the next run with >300 days is currently in progress. To understand the properties of this detector calibration measurements with sources of known energy are needed. Due to the large size of the detector, external sources are insufficient for this purpose: to characterize the inner, active target volume internal calibrations must be used. This poster presents an overview of the methods, advantages and challenges associated with using Kr-83m as an internal calibration source. Among the detector properties that can be investigated with Kr-83m are the lifetime of drift electrons, light- and charge-yield uniformity in the detector volume and stability over time, and the effects of localized detector features on event position reconstruction. This work is supported by BMBF under contract 05A17PM2.