Reports until 17:01, Tuesday 08 April 2025
H1 SEI
jim.warner@LIGO.ORG - posted 17:01, Tuesday 08 April 2025 - last comment - 11:59, Wednesday 09 April 2025(83824)
Dial indicators added on -X of HAM1, 2/4 HEPI actuators disconnected

This morning, we added dial indicators to the ends of the support tubes to monitor the support tube locations on the -X side. We had to remove a cable tray to get room to do this under the chamber. They are protected under the chamber, but there is a bunch of loose cabling on that side that could bump my set up. Unfortunately, we don't have access to the northside. Not quite sure how to track the support tube ends on the +X side when we float HEPI yet.

While Betsy and crew were pulling parts in chamber, Mitch and I were disconnecting actuators at the piers. Vertical actuators are quite difficult, access is very tight, going to be hard reconnecting them. Horizontal actuators are a lot easier, but we are adding .100" shims and bolts to protect the bellows and IPS, we lost a couple shims inside one of the actuators and it was a struggle to fish them out. We are adding wires to the shims going forward to prevent that mishap. We'll get the other 2 actuators tomorrow. So far dial indicators show we are still in the same spot as before disconnecting the actuators.

Comments related to this report
jim.warner@LIGO.ORG - 11:59, Wednesday 09 April 2025 (83834)

All 4 actuators are disconnected now, we'll move to passive stack de-install after lunch. Dial indicators we have move .002", but that could very well just be drift in my set up.