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T: Fachverband Teilchenphysik
T 18: Methods in Astroparticle Physics I
T 18.7: Vortrag
Montag, 16. März 2026, 17:45–18:00, KS 00.004
Evaluating Dry Nitrogen Purging to Reduce Water Adsorption in Ultra-High-Vacuum Beam Tubes — Charlotte Benning, •Hsiang-Chieh Hsu, Tim Kuhlbusch, Achim Stahl, and Jochen Steinmann — III. Physikalisches Institut B, RWTH Aachen
The Einstein Telescope (ET) requires 120 km beam pipes with a diameter of one meter. Additionally, to achieve the design sensitivity of the ET, a residual pressure below 10−10 mbar is required. Meeting both requirements will make the vacuum cost to about one-third of the total anticipated budget using current production and vacuum technologies. Continuous on-site manufacturing of the beam pipes in the tunnels can lower the cost while requiring novel cleaning method. Laser cleaning is proposed to be used to clean ferritic stainless steel surfaces and remove adsorbed water, eliminating the need for high-temperature and time-consuming bakeout. Therefore, controlling moisture re-adsorption is crucial. This work investigates how the dryness of the purging gas (nitrogen) influences the re-adsorption of water vapor on surfaces after cleaning, to identify the dryness level that keeps water contamination acceptably low.
Keywords: Ultra-High-Vacuum; Dry Nitrogen Purging; Einstein Telescope; Re-adsorption of water