Karlsruhe 2024 – scientific programme
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T: Fachverband Teilchenphysik
T 18: Search for Dark Matter 1
T 18.6: Talk
Monday, March 4, 2024, 17:15–17:30, Geb. 30.35: HSI
Tests of wire electrodes with the Mainz high resolution scanning set-up — •Alexander Deisting1, Jan Lommler1, Shumit Mitra1, Uwe Oberlack1,2, Fabian Piermaier2, and Quirin Weitzel2 — 1Institut für Physik & Exzellenzcluster PRISMA+, Universität Mainz — 2PRISMA Detector Laboratory, Universität Mainz
When searching for dark matter with dual-phase time projection chambers (TPCs) the quality of the TPC’s electrodes is crucial for the experiments success, as the electrodes’ performance affects the overall signal quality and smoothness of detector operation. For experiments similar to XENONnT, these electrodes are meshes or grids with wire diameters of 200−300 µm, operated at a high voltage (HV) ≫1 kV. Future experiments as Darwin plan to use a similar technology.
The scanning set-up at the PRISMA Detector Laboratory in Mainz features several tools for metrology mounted on a gantry robot system: A high resolution camera (resolution: 1.4×1.4 µm2), a 3D confocal microscope (resolution better than 1 µm), and a laser-distance measurement system, which can be used to measure wire sagging down to the O(10 µm) scale. The set-up allows for electrodes to be tested at HV and in an argon atmosphere.
In this talk we will discuss electrode assays utilising intentional corona discharges at the wires and lessons learned from that. Furthermore, we will report on wire sagging measurements done with XENONnT sized electrodes and on the resulting conclusions for similar studies with Darwin sized electrodes.
Keywords: time projection chamber; dual-phase; electrodes; Darwin; quality assurance