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Reports until 16:57, Thursday 30 May 2013
arnaud.pele@LIGO.ORG - posted 16:57, Thursday 30 May 2013 - last comment - 09:59, Wednesday 16 April 2014(6552)
MCs Phase 3b

MC1 MC2 and MC3 Phase 3b M1 to M1 transfer functions have been measured over the past weekend. They all show good agreement with model and previous measurements.

The attached files are showing comparison between model, phase 3a and 3b (except for MC2 3b vs 3b)

MC1 (allhstss_2013-05-29_Phase3b_H1MC1_ALL_TFs.pdf)

MC2 (allhsts_2013-05-29_Phase3b_H1MC2_ALL_TFs.pdf)

MC3 (allhsts_2013-05-29_Phase3b_H1MC3_ALL_TFs.pdf)


files and data have been commited on the svn under the following directories :

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arnaud.pele@LIGO.ORG - 09:59, Wednesday 16 April 2014 (11383)

All of those top stage transfer functions look good.
The only thing to note is that MC2 has its pitch (1Hz) and roll modes (1.5Hz) coupled into the vertical mode as seen on the 3rd page of the 2nd pdf. It is significantly reduced by the damping
This coupling increased after pump down (orange/pink vs cyan/green).

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