Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 50: Search for Dark Matter 2

T 50.1: Vortrag

Dienstag, 22. März 2022, 16:15–16:30, T-H35

Optimisation of the TPC aspect ratio for the DARWIN observatory — •Sebastian Vetter — Institute for Astroparticle Physics (IAP), Karlsruhe Institute of Technology (KIT)

DARWIN is a proposed next-generation astroparticle physics observatory focused on the direct detection of WIMP Dark Matter. It will use 40 tonnes of natural xenon inside a dual-phase Time Projection Chamber (TPC) following the technology of the successful detectors that use noble elements as active material. Due to the elusive nature of Dark Matter and the envisaged unprecedented discovery potential, DARWIN requires an ultra-low background level.

The final design of many components of the detector is not decided yet. One of the central parameters for optimization is the aspect ratio (AR) of the TPC. A higher AR leads to better light collection and shorter electron drift lengths, but also comes with different fractions of sensor and cryostat materials, being a source of external background.

In this talk we present results based on detailed 3-dim Monte Carlo simulations on the influence of the AR on the S1 signal detection efficiency for WIMPs as well as on background components such as dark count rates and neutrons from the TPC materials.