In July 2012 the top masses of the quadruple suspensions ITMY and ETMY were excited in order to obtain power spectra from the 24 OSEM sensor readback channels (6 on main chain top, 6 on reaction chain top, 4 on L1 stage, 4 on L2 stage). From these measurements the frequencies of 22 (between 0.1 - 6.0 Hz) out of the 24 mechanical resonances were found. These have been recorded in the aLIGO wiki https://lhocds.ligo-wa.caltech.edu/wiki/mark.barton/ResonanceTest
This wiki page is designed so that when the resonant frequencies of the other suspensions (HSTS , HLTS, BS) or other quadruple suspension resonances are measured they can be easily added to this catalogue of known measured and predicted frequencies. The idea is to have a list of identified features in the spectra of certain known channels, as was done in iLIGO: http://blue.ligo-wa.caltech.edu:8000/iLIGO/H1_Resonances (LVC login). The list may prove useful to aLIGO commissioners or detector characterization scientists trying to track down glitches.
The data and templates for these measurements resides in:
/ligo/svncommon/SusSVN/sus/trunk/QUAD/H2/ETMY/SAGL2/2012-07-25_top_actuation_ETMY_4times_power.xml
/ligo/svncommon/SusSVN/sus/trunk/QUAD/H2/ITMY/SAGL2/2012-07-25_top_actuation_test.xml