J. Kissel

We're on a campaign to complete the collection of up-to-date top mass open loop gain TFs for the damping loops (see inventory prior to today in LHO:85289). The QUAD main M0 chain had never been measured, and thus had no tuned-excitation templates to start from, but the ETMY reaction R0 chain had been, and the drive chains and plant are quite similar. So, I've copied over the ETMY R0 templates for the Open Loop Gain TFs and renamed, and ran a "sed -i" to change them to ETMX R0 templates, and hit "go." It worked! Some minor adjustments were needed; e.g. some DOFs needed their gain reduced, and a few resonant gain filters Q reduced.

Here's the set of measured new templates committed to the svn in the following location. 

Since the excitation depends on the damping filters installed, I attach a screenshot of the damping loop MEDM screen during the measurement.
    /ligo/svncommon/SusSVN/sus/trunk/QUAD/H1/ETMX/SAGM0/Data
        2025-07-01_1530_H1SUSETMX_M0_WhiteNoise_L_0p01to50Hz_OpenLoopGainTF.xml
        2025-07-01_1530_H1SUSETMX_M0_WhiteNoise_P_0p01to50Hz_OpenLoopGainTF.xml
        2025-07-01_1530_H1SUSETMX_M0_WhiteNoise_R_0p01to50Hz_OpenLoopGainTF.xml
        2025-07-01_1530_H1SUSETMX_M0_WhiteNoise_T_0p01to50Hz_OpenLoopGainTF.xml
        2025-07-01_1530_H1SUSETMX_M0_WhiteNoise_V_0p01to50Hz_OpenLoopGainTF.xml
        2025-07-01_1530_H1SUSETMX_M0_WhiteNoise_Y_0p01to50Hz_OpenLoopGainTF.xml

I'll make comments about the *results* of the measurement in a separate aLOG.