Göttingen 2025 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 104: Search for Dark Matter V
T 104.2: Vortrag
Freitag, 4. April 2025, 09:15–09:30, VG 4.102
Development of assay techniques for the electrodes of a future xenon-filled dark matter obsevatory — •Alexander Deisting1, Jan Lommler1, Shumit Mitra1, Uwe Oberlack1,2, Fabian Piermaier2, and Quirin Weitzel2 — 1Institut für Physik & Exzellenzcluster PRISMA+, Johannes Gutenberg-Universität (JGU) Mainz — 2PRISMA Detector Laboratory, JGU Mainz
Dual-phase xenon time projection chambers (TPCs) lead the search for WIMP dark matter. Current experiments (LZ, XENONnT, PandaX-4T) feature electrode diameters between 1 m and 1.5 m. The XLZD collaboration plans a next generation dual-phase TPC with 3 m height and diameter, representing an extraordinary scale for this technology.
Existing TPCs have struggled to achieve their design electric fields, making it ever more crucial for the XLZD TPC to ensure exceptional electrode quality. To address this challenge, a set-up has been developed in Mainz to evaluate electrode performance. It allows the measurement of electrostatic sagging, the analysis of wire quality with high resolution imaging and confocal microscopy, and the detection of small scale defects by measuring local currents associated with Townsend discharge in an electric field. For the latter, a custom tool was developed and mounted on a gantry together with other metrology components (camera, laser-distance sensors, and a confocal microscope). This talk benchmarks the sagging measurement capabilities and the performance of the discharge-based defect detection system. This work is part of ongoing efforts by XENONnT and DARWIN collaborators to develop improved electrodes for current and future experiments.
Keywords: direct dark matter detection; dual-phase xenon TPC; electrode; electrostatic sagging; Townsend discharge