Hamburg 2016 – scientific programme

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T: Fachverband Teilchenphysik

T 39: Suche nach dunkler Materie II

T 39.2: Talk

Monday, February 29, 2016, 17:05–17:20, VMP9 SR 28

Commissioning of the XENON1T liquid level measurement system — •Christopher Geis — Institut für Physik, Johannes Gutenberg-Universität, Mainz

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 installation, commissioning and first measurement data of two kinds of level meters operated in the XENON1T TPC: 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. The long level meters are cylindrical double-walled capacitors, 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. Further, we present the design and programming of the readout electronic based on the UTI chip by Smartec, which allows to read all six levelmeters simultaneously.