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Reports until 08:48, Saturday 23 May 2026
H1 SUS
betsy.weaver@LIGO.ORG - posted 08:48, Saturday 23 May 2026 (90329)
BBSS alignment status

(Betsy, RyanC, Jason)

Friday we spent more time understanding why the Yaw mechanics weren't effective on the BBSS. We found that a lot of the top mass OSEMs interfere a lot when adjustments are made so they were constantly hanging up and giving us false reading of our adjustments. So we ended up disassembling half the suspension, stripping all top BOSEMs and the middle stage 4-BOSEMs via the entire plate. Then we started to see actual Yawing with the adjustments. In the process however, we stripped one of the 10 blade locking screws. So more disassembly to remove the sheet plate and eventually the bolt.  We now have yaw in the ballpark, but need damping. Facepalm. So will resume reassembling the whole suspension and get damping going asap next week.  Will need to revisit the L measurement after we finish Y and P.

 

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