jeffrey.bartlett@LIGO.ORG - posted 14:30, Wednesday 06 March 2013 - last comment - 11:53, Wednesday 20 March 2013(5684)
Phase 1b Testing I1-MC1
We took TFs and Power Spectra data for HSTS I1-MC1. All files have been committed to the SVN repository. The data files are attached below for review by Stuart A. and Jeff K.
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My only minor concern is what appears to be a roll mode ever so slightly coupling into longitudinal + transverse DOFs. Although, damping appears to suppress this coupling on I1-MC1. After discussing this with Jeff B over the phone, he and his assembly team will check flag alignments.
Under close inspection, MC1 looks to exhibit similar R-T cross-coupling as has been seen on the L1 SRM suspension (see LLO aLog entry 6451), although shifted in frequency consistent with the shift in the roll mode. However, the MC1 R-T coupling is significantly weaker than for SRM, and having raised this with both Norna R and Jeff K, we feel that this minor feature should be noted, and that MC1 can be approved through Phase 1b.