Reports until 12:18, Tuesday 18 July 2023
H1 SUS
jeffrey.kissel@LIGO.ORG - posted 12:18, Tuesday 18 July 2023 - last comment - 08:48, Tuesday 25 July 2023(71465)
More H1 SUS BS damping Characterization 
J. Kissel

This is a continuation of building up a template suite for characterization of H1 SUS BS damping loops (most recently rekindled in LHO:71269).

Got some more data on the beam splitter damping today. Got open loop gain TFs of the top mass M1 damping with M3 optical lever to M2 actuator damping loops on to see the impact (to make sure they weren't causing the top mass to go unstable), then got one DOF's worth of drive tuning (pitch) to measure the optical lever damping's open loop gain TFs.

The data lives here:
    /ligo/svncommon/SusSVN/sus/trunk/BSFM/H1/BS/SAGM1/Data
        2023-07-18_1740_H1SUSBS_M1_CDBIOState_1_OLDampingON_WhiteNoise_L_0p01to50Hz_OpenLoopGainTF.xml
        2023-07-18_1740_H1SUSBS_M1_CDBIOState_1_OLDampingON_WhiteNoise_P_0p01to50Hz_OpenLoopGainTF.xml
        2023-07-18_1740_H1SUSBS_M1_CDBIOState_1_OLDampingON_WhiteNoise_Y_0p01to50Hz_OpenLoopGainTF.xml

    /ligo/svncommon/SusSVN/sus/trunk/BSFM/H1/BS/Common/Data/
        2023-07-18_1805UTC_H1SUSBS_M2M3_OplevDamping_OpenLoopGainTF.xml

The results, comments, etc. will be shared in the fullness of time; just have time for this "I measured the thing!" aLOG.
Comments related to this report
jeffrey.kissel@LIGO.ORG - 08:48, Tuesday 25 July 2023 (71679)
Link 

FYI, the optical lever damping loop open loop gain transfer functions were taken with the M2 (triple acquisition, or TACQ) coil driver set to state 2 (ACQ ON, LP OFF), and -- importantly -- the optical lever damping loop filter bank limiters, H1:SUS-BS_M2_OLDAMP_P_LIMIT and H1:SUS-BS_M2_OLDAMP_Y_LIMIT is OFF (it's nominally set at 99e3 [ct]).
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