Wuppertal 2015 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 56: Experimentelle Methoden: unterschiedliche Techniken
T 56.5: Vortrag
Dienstag, 10. März 2015, 17:50–18:05, K.12.18 (K3)
Removal of noble gases out of xenon by a cryogenic distillation column for the XENON1T experiment — •Michael Murra, Gianmarco Bruno, Alexander Fieguth, Christian Huhmann, Stephan Rosendahl, Sergej Schneider, and Christian Weinheimer — Institut für Kernphysik, Westfälische-Wilhelms Universität Münster
The XENON1T experiment is the next generation experiment for the direct detection of dark matter in the form of Weakly Interacting Massive Particles (WIMPS). With its 3.3 tons of liquid xenon XENON1T will increase the sensitivity on the WIMP-nucleon cross section down to 2.0 × 10−47 cm2, which is more than one order of magnitude better than the current best limits by LUX and XENON100. A key requirement to reach this sensitivity is the reduction of radioactive backgrounds such as 85Kr and 222Rn. Because of different boiling points of Kr and Xe both components can be separated by a cryogenic distillation column, which has been constructed and characterized for XENON1T, where a reduction factor greater 120000 has been confirmed. Based on the same principle, the separation of Rn and Xe by cryogenic distillation is currently being tested at XENON100, using the system as radon source and detector at the same time. The cryogenic distillation column, the krypton removal measurements as well as the radon removal tests will be presented. Different aspects of this project have been funded by DFG-Großgeräte, BMBF and Helmholtz-Alliance for Astroparticle Physics (HAP)