One month ago the Beam Splitter (BS) tower was installed in the bottom part of the vacuum vessel at #ETpathfinder. Now that all filters have been tuned, the vacuum vessel can be closed.
@maastrichtu.bsky.social @nikhef.bsky.social @einsteintelescope.bsky.social
youtu.be/6-TxZI1W8tA
youtu.be
Closing BS vacuum vessel @ ETpathfinder
YouTube video by Marco Kraan