Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 58: Poster - Astroteilchenphysik
HK 58.1: Poster
Mittwoch, 6. März 2013, 16:45–19:00, HSZ 4.OG
Distillation Column for XENON1T Dark Matter Project — •Michael Murra1, Ethan Brown1, Stephan Rosendahl1, Ion Cristescu2, Christian Huhmann1, Alex 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 < 2.0 × 10−45 cm2, XENON1T will achieve an increased sensitivity by two 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. One dominant radioactive contamination at this level is 85Kr, which has a beta-decay with an endpoint energy of 687keV. To reach the final sensitivity, the xenon has to be purified to a concentration of < 0.5 ppt (parts per trillion) natural krypton in xenon. Because of different boiling points of Kr and Xe a cryogenic distillation column is used to achieve the required purity. For XENON1T, a rectification column, which operates with partial reflux, is being constructed and characterized to purify ≈ 3 tons of xenon. The key features of this column will be presented, along with a status of the construction.
Different aspects of this project have been funded by DFG-Großgeräte, BMBF and Helmholtz-Alliance for Astroparticle Physics (HAP).