Wuppertal 2015 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 7: Dunkle Materie I
T 7.6: Vortrag
Montag, 9. März 2015, 15:20–15:35, I.13.65 (HS 26)
Capacitive liquid level measurement in the XENON1T time projection chamber — •Christopher Geis — Institute of Physics, Johannes Gutenberg University, Mainz, Germany
Two-phase xenon time projection chambers (TPCs) have been operated very successfully in direct detection experiments for dark matter. This kind of detector uses liquid xenon as the sensitive target and is operated in two-phase (liquid/gas) mode, where the liquid level needs to be monitored and controlled with sub-millimeter precision.
We present the design, simulation and the development of two kinds of level meters going to be operated in XENON1T: short level meters are three-plated capacitors measuring the level of the liquid-gas interface with a measurement range h ≈ 5 mm and a resolution of Δ C/h ≈ 1 pF/mm. First test results show that based on this values a level resolution of 10−2 mm can be reached. Further, we present the different design solutions for the long level meters: a cylindrical double-walled capacitor design as well as a design based on printed circuits, measuring the overall filling level of the XENON1T TPC at a measurement range of h = 1.4 m and a resolution of Δ C/h ≈ 0.1 pF/mm.