J. Kissel
[[This is a more detailed version of LHO aLOG 8590, for completeness]]

In-air, chamber-side testing of the H1 SUS OMC (an OMCS) has been successful, and the suspension is approved for install. The only things of note:
(1) The middle mode of Pitch to Pitch transfer function, modeled to be at 1.9 [Hz], has stiffened up to higher frequency, revealing that cabling is stiffening up the SUS, as has already been seen at LLO (see LLO aLOG 9570). I've informed Koji and Jeff Lewis, and they will work on softening up the connections as best they can. Like the reaction chain on the QUADs, it doesn't really matter, because the high-frequency behavior remains equally isolated (where it counts), but we should on a target-of-opportunity, best-effort basis try to get the cabling loose enough to get to at least Livingston's level, if not back to the what the model expects (which, is cable-free). The requirement is that one is conscious of it, and spend some time on it, but on the order of 30 minutes, not 30 hours.
(2) The damping loops (documented in LHO aLOG 8571) are in no-way commissioned using any quantitative metric. Thus, what little difference is seen between damped and undamped spectra is sad, but not unexpected. We'll commission these better later, I promise.
(3) It really is impressive to see the amount of isolation one gets between chamberside testing and on an in-vacuum, damped only isolation platform. Way to go team SEI/SUS!

-----------
Details

Undamped Transfer Function data set: 2013-11-15_1830
Damped Transfer Functions data set: 2013-11-15_2153
Damped/Undamped Spectra: 2013-11-15_2200

TF Comparions:
L1 OMC M1 (2013−06−16_1200): Phase 2b, chamberside, in air, damping OFF
L1 OMC M1 (2013−06−19_1055733803): Phase 2b, chamberside, in air, damping ON
L1 OMC M1 (2013−08−28_1030): Phase 3b, in-vacuum, damping off, ISI damping only
H1 OMC M1 (2013−11−15_1830): Phase 2b, chamberside, in air, damping OFF
H1 OMC M1 (2013−11−15_2153): Phase 2b, chamberside, in air, damping ON

Spectra Comparisons:
L1SUSOMC 2013−06−17_0900: Phase 2b, chamberside, in air
L1SUSOMC 2013−10−23_1130: Phase 3b, in-vacuum, ISI damping only
H1SUSOMC 2013−11−15_2200: Phase 2b, chamberside, in air

All data. scripts, and plots have been committed to the SusSVN as of this entry.