arnaud.pele@LIGO.ORG - posted 14:01, Thursday 11 April 2013 - last comment - 09:12, Friday 19 April 2013(6032)
PR2 TF
Looking at PR2 transfer functions ran yesterday night, an extra resonnance appears at 2.8 Hz for M1 pitch to pitch transfer function when comparing it to the model and phase 3a testing transfer functions ran on december 2012.
Betsy and Travis are investigating to find its source.
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Attached is the pdf with all DOF and comparisons with LHO measurements ( "allhstss[...]") with the following legend :
- Phase 2a (july 2012)
- 2b (august 2012)
- 3a (december 2012)
- 3a (last one april 2013)
- 3a (last one april 2013 damping on)
- Model
The second pdf ("2013-04-10[...]") shows -in addition to the comparison between measurement and model for every DOF- the coupling between DOF and individual OSEMs which might be helpful for understanding what's going on.
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We decided to approve phase 3a for PR2, and postpone the investigation for next time the chamber we'll be open.