jeffrey.kissel@LIGO.ORG - posted 14:32, Friday 10 November 2017 - last comment - 13:29, Tuesday 14 November 2017(39382)
H1 SUS MC2 -- Was Rubbing (likely the whole week), Now Fixed
J. Kissel, B. Weaver While we waited for the PSL to figure out at what temperature it would like to be (see LHO aLOG 39371), I took top-to-top mass transfer functions of all the HAM2 / HAM3 suspensions. In doing so, I discovered that MC2 was rubbing. As such, Betsy -- while out on the floor for other reasons -- dipped in to HAM3 and found that a few of the barrel stops were grazing the optic. She backed them off, and I re-ran TFs that indeed confirmed this was the source of the rubbing. I attach screenshots of the 6 DOFs of TFs. Black 2017-08-01_1733 -- pre-vent clean reference data Blue 2017-11-10_1722 while MC2 was rubbing Red 2017-11-10_1829 after Betsy releaved the EQ stop rubbing Repeat: MC2 is now free of rubbing.
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For future reference -- on the barrel stops that were rubbing the optic: two of the eight were rubbing, on opposite corners (low on one side, high on the other), but it was too dark in chamber to tell to precisely identify which ones.