Today from ~ 3:00 pm to 5:20 pm local time I excited the TOP stage of the Y arm suspensions (first ITMY, then later ETMY) in order to gather peak height data to help with diagonalizing the OSEM sensor readbacks.  Power spectra were recorded with damping at the top stage turned OFF, while an excitation of white noise was simultaneously injected into all 6 degrees of freedom of the top stage.  The XML templates are saved in the suspension directories:


/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


I also tried to drive the L2 stage of ITMY with damping OFF at the top stage, but failed to get any coherence in this power spectrum measurement.