Hamburg 2016 – scientific programme
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T: Fachverband Teilchenphysik
T 39: Suche nach dunkler Materie II
T 39.5: Talk
Monday, February 29, 2016, 17:50–18:05, VMP9 SR 28
Commssioning of the cryogenic distillation column for the XENON1T experiment — •Michael Murra for the XENON collaboration — Institut für Kernphysik, WWU Münster
The recently inaugurated XENON1T experiment, located in the Laboratori 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 will utilize about 3.5 tons of liquid xenon in order to reach a projected sensitivity of 2· 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 cryogenic distillation. A krypton concentration of less than 0.2 · 10−12 (0.2 parts per trillion) in xenon is required to achieve the desired sensitivity of the XENON1T experiment. Within this talk, the commissioning of the cryogenic distillation column, specially developed for XENON1T, at LNGS, along with the validation of a reduction factor greater 105, will be presented. Different aspects of this project have been funded by Großgeräte (DFG + state NRW), BMBF and Helmholtz-Alliance for Astroparticle Physics (HAP).