J. Kissel, R. Kumar, T. Shaffer

After debugging the SQZ green fiber one more time (see LHO aLOG 52420), we were given 30 minutes to make an assessment of all 6 suspensions in HAM6. We were able to gather all DOFs of all suspensions, and they all look as free of rubbing as one can tell from an in-air measurement. We are OK for doors. 

Eventually we will analyze the data in full and compare against previous (or maybe not, we may just wait until we have measurements of the SUS under full hard vacuum and with the SEI system is its nominal observing state).

The hardest to measure continues to be the OPOS, the suspension platform for the in-vacuum OPO system for the squeezer. I've found an in-air configuration that works well enough to assess the health, and give more details below.
For all other suspensions we were able to just open up the template, turn off the damping loops, and hit "go" getting wonderfully clean measurements (all coil drivers for each SUS in HAM6 are either forced to have only one configuration [the OPOS, OMs and ZM1], or is always left in its highest noise state [the OMC].).

% Measurement Details:
In order to gather acceptable data on the OPOS while it was in-air, on a damped ISI and locked HEPI:
    (1) Turn the purge air down, if allowed (Thanks Betsy!)
    (2) The OPOS does not have switchable coil driver states, and it's fixed in its lowest noise state (see T1700434), so the coil driver request must remain in State 2.
    (3) For all the DOFs you're *not* measuring, leave the damping loops ON. (this necessarily means you'll have less fundamental cross-coupling in multi-DOF modes, like the L and P modes)
    
Also, I've re-tuned the amplitude / frequency response of the drive excitation to have much more drive at the resonances, and less gain at low frequency, and a jacked up overall gain. Some of the templates will "saturate the DAC" according to the front-end model's CDS BIT WORD, but ASDs of the MASTER OUT channels from each OSEM DOF show that the RMS of the requested drive at all frequencies is less than (2^15 ct_pk) * (1 ct_rms / sqrt(2) ct_pk) = 23170 ct_rms, where 2^15 is the peak value allowed for the OPOS 16-bit DAC (it's likely that -- because of the poor normalization of the digital AA filters that upsample from the OPOS model rate of 16384 Hz to the native IO chassis rate of 65536 Hz -- there's a ~10% amount of gain peaking that amplified the signal at many kHz, and thus saturating the DAC at those frequencies. Blah blah blah there may be some level of non-linear effects going on but the magnitude, phase, and coherence look good enough to assess an "are the dynamics OK" answer.)

As a tease, I attached one DOF (pitch to pitch) of the OPOS to show you the kind of data quality I'm able to get after all of the above.

Those new templates live here:

/ligo/svncommon/SusSVN/sus/trunk/OPOS/H1/OPO/SAGM1/Data/
    2019-10-11_2025_H1SUSOPO_M1_WhiteNoise_L_0p02to50Hz.xml
    2019-10-11_2025_H1SUSOPO_M1_WhiteNoise_P_0p02to50Hz.xml
    2019-10-11_2025_H1SUSOPO_M1_WhiteNoise_R_0p02to50Hz.xml
    2019-10-11_2025_H1SUSOPO_M1_WhiteNoise_T_0p02to50Hz.xml
    2019-10-11_2025_H1SUSOPO_M1_WhiteNoise_V_0p02to50Hz.xml
    2019-10-11_2025_H1SUSOPO_M1_WhiteNoise_Y_0p02to50Hz.xml

The data for all other suspensions in HAM6 live in the following directories:
/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/
    OM1/SAGM1/Data/
        2019-10-11_2000_H1SUSOM1_M1_WhiteNoise_L_0p02to50Hz.xml
        2019-10-11_2000_H1SUSOM1_M1_WhiteNoise_P_0p02to50Hz.xml
        2019-10-11_2000_H1SUSOM1_M1_WhiteNoise_Y_0p02to50Hz.xml

    OM2/SAGM1/Data/
        2019-10-11_2000_H1SUSOM2_M1_WhiteNoise_L_0p02to50Hz.xml
        2019-10-11_2000_H1SUSOM2_M1_WhiteNoise_P_0p02to50Hz.xml
        2019-10-11_2000_H1SUSOM2_M1_WhiteNoise_Y_0p02to50Hz.xml

    OM3/SAGM1/Data/
        2019-10-11_2000_H1SUSOM3_M1_WhiteNoise_L_0p02to50Hz.xml
        2019-10-11_2000_H1SUSOM3_M1_WhiteNoise_P_0p02to50Hz.xml
        2019-10-11_2000_H1SUSOM3_M1_WhiteNoise_Y_0p02to50Hz.xml

    ZM1/SAGM1/Data/
        2019-10-11_2000_H1SUSZM1_M1_WhiteNoise_L_0p02to50Hz.xml
        2019-10-11_2000_H1SUSZM1_M1_WhiteNoise_P_0p02to50Hz.xml
        2019-10-11_2000_H1SUSZM1_M1_WhiteNoise_Y_0p02to50Hz.xml

/ligo/svncommon/SusSVN/sus/trunk/OMCS/H1/OMC/SAGM1/Data/
    2019-10-11_2045_H1SUSOMC_M1_WhiteNoise_L_0p02to50Hz.xml
    2019-10-11_2045_H1SUSOMC_M1_WhiteNoise_P_0p02to50Hz.xml
    2019-10-11_2045_H1SUSOMC_M1_WhiteNoise_R_0p02to50Hz.xml
    2019-10-11_2045_H1SUSOMC_M1_WhiteNoise_T_0p02to50Hz.xml
    2019-10-11_2045_H1SUSOMC_M1_WhiteNoise_V_0p02to50Hz.xml
    2019-10-11_2045_H1SUSOMC_M1_WhiteNoise_Y_0p02to50Hz.xml