Münster 2017 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 55: Suche nach Dunkler Materie 2 (Direkter Nachweis)
T 55.4: Vortrag
Dienstag, 28. März 2017, 17:40–17:55, VSH 19
Online krypton removal at the XENON1T experiment — •Michael Murra for the XENON collaboration — Institut Für Kernphysik, Münster
The operating XENON1T experiment, located in the Laborati Nazionali del Gran Sasso (LNGS), is the next generation experiment for the direct detection of dark matter in the form of Weakly Interacting Massive Particles (WIMPS). The new detector utilizes about 3.3 tons of liquid xenon in order to reach a projected sensitivity of 1.6×10−47 cm2 for a WIMP mass of 50 GeV/c2. A key requirement to reach this sensitivity is the reduction of radioactive backgrounds such as 85Kr, which has a beta-decay with an endpoint energy of 687 keV. Due to the difference in vapor pressure, the concentration of natural krypton in xenon can be reduced by several orders of magnitude by using a cryogenic distillation column. Such a distillation column has been operated in a closed loop with the XENON1T detector system in order to reduce the krypton concentration below 1 ppt for the first dark matter run. This so-called online removal will be presented within this talk. Different aspects of this project have been funded by DFG Großgeräte, BMBF and Helmholtz-Alliance for Astroparticle Physics (HAP).