Reports until 10:03, Tuesday 03 April 2018
H1 SUS
betsy.weaver@LIGO.ORG - posted 10:03, Tuesday 03 April 2018 (41262)
ETMX reaction mass mass weights for rebuild

Between ETMY closeout work at EY, Travis and I continue to rebuild the ETMX suspension at EY.

We're working towards installation of the new AERM07 mass into the reaction chain.  Last week we removed the ERM02 mass from the lower structure frame.  Yesterday we gutted the PenRe mass at the stage above this mass to rebuild it with heavier cans which compensate for the lighter AERM with the hole in the middle.  The 2 lowest masses of this reaction chain need to maintain their total before-rebuild weight, so the PenRe will need to be built to 64,303g:

  OLD Weights (g) NEW Weights (g)
PenRe Mass 53,183* 64,303
ERM02/AERM07 Mass 26,055* 14,935*
Total PenRe+A/ERM 79,238 79,238

* Weighed with scale during this rebuild

For my record keeping:

  OLD PenRe NEW PenRe
Parts in Body of mass 21,023* 32,143
Body 32,160* 32,160*
Total PenRe 53,183* 64,303