Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 72: Experimental techniques in astroparticle physics III

T 72.4: Talk

Wednesday, March 17, 2021, 16:45–17:00, Tv

Offline xenon purity monitoring combining APIMS and gas chromatography — •Veronica Pizzella and Hardy Simgen — Max-Planck-Institut für Kernphysik, Heidelberg

Dual-phase xenon TPCs are among the most sensitive detectors for Dark Matter in direct searches. For the success of these experiments, it is necessary to use xenon with low concentration impurities. Two classes of impurities are of concern: radioactive impurities such as Kr-85 and H-3, since they increase the background; electronegative molecules such as oxygen, since they reduce the amount of electrons in the TPC. In this presentation, an offline purity monitor is presented using the technique of Atmospheric Pressure Ionization Mass Spectrometry (APIMS), with a commercial APIX dQ from Thermo Fisher and a custom-designed chromatography setup. The presented system is able to detect chemical impurities at the sub-ppb level. The calibration of the system and some results are presented.