Mainz 2014 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
T: Fachverband Teilchenphysik
T 105: Experimentelle Methoden der Astroteilchenphysik 4
T 105.8: Vortrag
Donnerstag, 27. März 2014, 18:30–18:45, P7
Distillation Column for XENON1T Dark Matter Project — •Michael Murra1, Ethan Brown1, Stephan Rosendahl1, Ion Cristescu2, Christian Huhmann1, Alexander Fieguth1, and Christian Weinheimer1 — 1Institut für Kernphysik, Universität Münster — 2Karlsruhe Institute of Technology
The XENON1T experiment is the next generation experiment for the direct detection of dark matter in the form of Weakly Interacting Massive Particles (WIMPS). While current limits set by XENON100 and other experiments constrain the WIMP-nucleon cross section to σ < 2 × 10−45 cm2, XENON1T will achieve an increased sensitivity by 1.5 orders of magnitude by utilizing about 2.6 tons of liquid xenon. 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. To reach the final sensitivity, the xenon has to be purified to a concentration of < 0.1 ppt (parts per trillion) natural krypton in xenon. Because of different boiling points of Kr and Xe a cryogenic distillation column for XENON1T is being constructed and characterized to purify ∼3 tons of xenon. In the first construction phase, a 3 m test column was designed and assembled. The design and set up of this column will be presented, along with a status of current measurements and results such as the separation efficiency.
Different aspects of this project have been funded by DFG-Großgeräte, BMBF and Helmholtz-Alliance for Astroparticle Physics (HAP).