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O: Fachverband Oberflächenphysik

O 66: Vacuum Science Technology: Theory and Applications

O 66.10: Vortrag

Mittwoch, 19. März 2025, 17:45–18:00, H8

Different Approaches to Vacuum System Performance Improvement for the Einstein Telescope — •Charlotte Benning, Robert Joppe, Maike Kühler, Stefan Krischer, Oliver Pooth, and Achim Stahl — III. Physikalisches Insitut B, RWTH Aachen

The Einstein Telescope will be the next European gravitational wave detector. It requires about 120 km of vacuum tubes in tunnels with a diameter of 1 m for a laser beam to achieve the design sensitivity. The required pressure of less than 10⁻¹¹ mbar introduces the need for innovations that help with performance improvement and cost reduction. The current baseline concept of the vacuum system includes passive sections of stainless steel welded inside the tunnels and connected to pumping stations. Achieving ultra-high vacuum (UHV) in these tubes requires high pumping capacities and long bake-out times of the tubes, which are associated with high energy and equipment costs.
This talk discusses two possible improvements over the baseline design: Integrating non-evaporable getter (NEG) surfaces into the inside of the tubes to reduce costs and aiming for a more homogeneous distribution of pumping power (distributed pumping). Furthermore, forming seamless flanges from the pipe material eliminating the need for welding is presented, which is especially relevant for the underground environment of the Einstein Telescope.

Keywords: Ultra-high Vacuum; Einstein Telescope; Vacuum Tubes; Distributed Pumping; NEG