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Two Results from the Freiburg Astroparticle Lab

Two Results from the Freiburg Astroparticle Lab

The hermetic TPC prototype.

We just published two papers covering results from experiments we have conducted in our astroparticle physics laboratory in Freiburg. They mainly focus on R&D for future large-scale dark matter detectors and were funded by the ERC grant ULTIMATE.



The XeBRA platform for liquid xenon time projection chamber development

XeBRA is the versatile detector platform to perform R&D for liquid xenon detectors installed and operated in our laboratory. In this article we present the platform and introduce two detectors (dual-phase liquid xenon (LXe) TPCs) operated on it, Using data from these detectors, we determine some basic properties of LXe as detector medium: the field-dependence of the electron drift velocity as well as relative light and charge yields for different electric drift fields. 


Reduction of 222Rn-induced Backgrounds in a Hermetic Dual-Phase Xenon Time Projection Chamber

In this work we built and operated a small detector prototype to test the possibility to reduce the background from 222Rn, the dominant background source in current LXe-based dark matter searches, by a novel detector design which mechanically separates the dark matter target from the detector regions which emanate more 222Rn. By scaling up the result to the scale of a multi-ton.scale detector such as DARWIN, we can show that such hermetic detector design is very promising, even if full hermeticity cannot be achieved.