Reports until 16:39, Tuesday 24 February 2026
H1 AOS
betsy.weaver@LIGO.ORG - posted 16:39, Tuesday 24 February 2026 (89249)
JAC output periscope 2nd septum refl beam dumped
Jason, Jennie, Betsy

After working for a bit to try to beam dump the second Septum refl beam dump which also is coming off the IMC septum window, we finally came to a solution.  It involved stealing one of the SPI D1800140-07 smallest beam dump panels and also putting it into the same mount as the first panel.  These 2 beams are pretty close to the main beam at this location, but with the beams otherwise hitting the internal metal of the output periscope we could not come up with anything better.  It took us quite a few small adjustments and many pictures to convince ourselves we are not clipping, but the attached picture is the best visual of the situation.  Commissioners agree that this is what we will live with.
Images attached to this report