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Reports until 16:38, Thursday 16 April 2026
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gerardo.moreno@LIGO.ORG - posted 16:38, Thursday 16 April 2026 - last comment - 17:17, Thursday 16 April 2026(89922)
BSC2 Dome is Removed

(Travis, Jordan, Randy, Betsy, Corey, Mitchell, Kim, Gerardo)

During the end of last week, Thursday and Friday, and during this week we had a chance to prepare the dome for its removal.  The annulus system was vented with nitrogen. Most bolts were removed last week, Jordan and Corey did a good job with that task.  Wiring for comms and electrical were removed early this week, as were the wires for the gauge pair and the annulus ion pump.  Electrical conduits were detached from the dome and pushed down and out of the way.
Today we were given the go ahead to remove the dome, dust monitor was checked, all zeroes, then the tent was removed, cables and counterweights were attached to the dome, spreader bar (with load cell) was attached to dome lifting lugs.  We already had a good gap at some points of the dome, but the O-rings were still very sticky, dome would not let go.  After prying from multiple points we were able to separate the dome from the chamber, the O-rings were checked and found to be stuck in a few spots, lifted the dome some more until we only had a little bit of play at the four remaining bolts.  We managed to unstick the O-rings with the O-ring tool without problems, once the O-ring was cleared, we removed the bolts and picked up the dome slowly, to make sure the O-ring was indeed free, since no issues were noted, Randy picked up the dome to almost clearing the top of the ISI, the O-ring protectors went on, then we installed a tall C3 cover on the ISI, it took 3 of us to accomplish that. We finished with the chamber cover fastened at the chamber flange with no issues, pretty soon the C3 cover billowed up due to the purge air.  Then our attention went to cover the dome opening, we then handed the dome over to Randy and Mitchell.  The tent went back up without problems and Randy parked the dome at the north bay floor, over some dunnage.

Thank you all for your help.

Images attached to this report
Comments related to this report
corey.gray@LIGO.ORG - 17:16, Thursday 16 April 2026 (89930)EPO

Photo & Video Shoot for the Dome Removal

Had a few cameras set-up (in addition to the one Fil installed earlier in the week, #89887).  

Fixed cameras:

  • Richard's iPad (closest to eMod) filming time lapse
  • My iPad near Hi-Bay roll-up door (also filming time lapse)
  • Canon60D on tripod also at Hi-Bay roll-up door, this was was only recording video, but it stopped/died before the actual Dome move started.
  • My old GoProMAX (360 camera), clamped on rail of bridge over the X-arm, filming time lapse.  

Mobile camera: 

  • My iphone, for roamong photos & video (ighlights attached to this entry).

Here is a link to all the video & photo files from the bulleted cameras listed above:  BSC1 Dome Removal Folder

  • To view file list with thumbnails, select Grid List button on the upper right.
  • Folder has 4-subfolders with all the files

Here is a funky look of the Dome Removal via the a full 360 file (unedited):  Trippy 360 clip

And here is a rough widescreen edit of the full-360 file above (to big to uploade to alog):   Widescreen rough cut of the above 360-file

Images attached to this comment
albert.lazzarini@LIGO.ORG - 17:17, Thursday 16 April 2026 (89932)
Great job! Kudos to the team.
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