travis.sadecki@LIGO.ORG - posted 16:14, Thursday 21 December 2017 - last comment - 16:39, Thursday 21 December 2017(39875)
PR3 chamber closeout TFs look good
New TFs match well with previously healthy TFs taken in July. Results can be found at:
/ligo/svncommon/SusSVN/sus/trunk/HLTS/Common/Data/allhltss_2017-12-21_H1_HLTS_Phase3a_PR3_M1_Doff_ALL_TFs.pdf
/ligo/svncommon/SusSVN/sus/trunk/HLTS/Common/Data/allhltss_2017-12-21_H1_HLTS_Phase3a_PR3_M1_Doff_ALL_ZOOMED_TFs.pdf
Snaps attached of P and Y for example.
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F. Clara, J. Kissel, R. McCarthy Sadly, we'd battled a bit of confusion while taking these close out TFs -- namely, that the T3 OSEM on the TOP coil driver that had failed earlier in the vent (see LHO aLOG 39541 FRS 9497) caused further problems manifesting as a *slight* change in the Pitch response of the top 2 top transfer functions (see attached screenshot). Rather than investigate thoroughly, we just swapped the coil driver with a spare. We'll include more details in the FRS after bench testing the failed driver. For now, PR3 remains with a temporary spare on one of its two TOP coil drivers. Attached is the pitch-to-pitch transfer function that revealed the problem. BLACK -- Prior to vent MAGENTA -- during T3 coil driver problem RED -- after problem was resolved
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