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Reports until 16:28, Thursday 25 January 2018
H1 SUS
travis.sadecki@LIGO.ORG - posted 16:28, Thursday 25 January 2018 - last comment - 16:41, Thursday 25 January 2018(40279)
ETMy fiber welding update

Today, we measured the violin modes of the new monolithic ETMy with the goal to determine what contributed to the large-ish pitch offset we were seeing.  Nothing egregious was found from violin modes themselves, so we decided to attempt to fix the pitch by re-stress-relieving the stock welded to the horns.  This technique has been done before, once here at LHO and once at LLO with success.  This time around, we went from ~5mRad differential pitch to ~500 uRad differential pitch.  Now, if only we could get a factor of 10 improvement in other aspects of LIGO in the course of a day. . . 

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jason.oberling@LIGO.ORG - 16:41, Thursday 25 January 2018 (40280)

See final alignment numbers at this alog.

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