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Cleanroom ETpathfinder - October 2, 2025

This is the first of 6 suspended towers of ETpathfinder. This Beam Splitter tower consists of four 3.5-meter-high Inverted Pendulus (IPs), three Geometric Anti-Spring (GAS) filters and an 1.3x1.3m optical table (which weighs almost 400 kg).
Dozens of white (Teflon insulated) cables connecting the instruments on the tower outside the vacuum vessel. Everything is ultra-high vacuum clean. Assembly of this tower took 3 months. The Beam Splitter tower will be placed in the bottom part of its vacuum chamber.
After placement, the filters and IPs must be 'tuned' to minimize vibrations on the optical table and then the vacuum chamber can be closed.
Five towers to go ...
Stan Heijnen, Mathijs Baars, Jurre de Wilde & Stefan Hild

ETpathfinder is a R&D infrastructure for testing and prototyping innovative concepts and enabling technologies for the Einstein Telescope, the first of a new class of future gravitational wave observatories.