J. Kissel, K. Arai, C. Gray, T. Shaffer, B. Weaver

After a great deal of inspection of the top mass, where I thought the OMCS was locked last night (see LHO aLOG 28883), the in-vacuum team list above identified that an earthquake stop on the bottom mass / breadboard / M2 stage was rubbing slightly. Once this EQ stop was backed off, all DOFs of the suspensions top to top mass dynamics returned to the expected results akin to the former OMC. Nice work team!

Attached are screenshots of drawings of the OMC with the offending EQ stop highlighted with a red square, as well as the transfer functions themselves. On the transfer function plots, 
BLACK shows the former OMC reference measurements, 
BLUE is yesterday's measurement with the EQ stop rubbing, and 
RED is the current OMC suspended, free of rubbing.

Templates for today's measurements live here:
/ligo/svbcommon/SusSVN/sus/trunk/OMCS/H1/OMC/SAGM1/Data
2016-08-05_1909_H1SUSOMC_WhiteNoise_L_0p2to50Hz.xml
2016-08-05_1909_H1SUSOMC_WhiteNoise_P_0p2to50Hz.xml
2016-08-05_1909_H1SUSOMC_WhiteNoise_R_0p2to50Hz.xml
2016-08-05_1909_H1SUSOMC_WhiteNoise_T_0p2to50Hz.xml
2016-08-05_1909_H1SUSOMC_WhiteNoise_V_0p2to50Hz.xml
2016-08-05_1909_H1SUSOMC_WhiteNoise_Y_0p2to50Hz.xml

Notes: 
- Because I wanted yesterday's measurements in the template as a reference, and we were in rush, I did not head my own advice and use the templates from 28736. Just keep this in mind. At least, this time, I'd paid attention to the frequency resolution and made it the same 0.02 Hz BW across all DOF's templates, but I did not add in the low-frequency boost. Again, one can stil get the information needed out of these templates, but they could be better.
- I only took a few averages. This is the luxury of having reference transfer functions and suspensions with very repeatable dynamics: we know immediately -- even after one average -- that if the resonance frequencies, zero frequencies, and their respective Qs line up with the reference then the suspension is healthy. More averages will just reduce the incoherent noise on the TF at all frequencies, and since these measurements are in air, we expect a good deal of incoherent noise at all frequencies anyway.