M. Ball, J. Driggers, S.Dwyer, A. Helmling-Cornell, J. Kissel

Not only did we gather the standard sensing function measurements as planned (LHO aLOG 50379), but we also went in to calibrataion problems exploration mode, trying to better understand what we thought was a detuned SRC optical spring. 

All measurements are complete for the day, and we used almost exactly 4.0 hours of "CALIBRATION" time in the observatory mode.

In addition to the "sensing measurements as a function of ETMY spot position" suite that Jenne covered in LHO aLOG 50380, we also gathered data for the lower two stages of the ETMX actuator as a function of ETMY spot position, to prove ourselves (and eventually you) that the reported ETMX actuator strength was not changing as a function of ETMY spot position -- even though the DARM OLGTF (driven by the DARM actuator, ETMX) was drastically changing as a function of ETMY spot position.

Lots more thinking to do.

He're all the data files from today's measurements:
/ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O3/H1/Measurements/FullIFOSensingTFs/
    Nominal ETMY Spot Positions (-15.7mm PIT, +13.2mm YAW):
    2019-07-03_H1_DARM_OLGTF_LF_SS_5to1100Hz_15min.xml
    2019-07-03_H1_PCALY2DARMTF_LF_SS_5t1100Hz_10min.xml
    2019-07-03_H1_PCALX2DARMTF_LF_SS_5t1100Hz_10min.xml

    2019-07-03_H1_PCALX2DARMTF_BB.xml
    2019-07-03_H1_PCALY2DARMTF_BB.xml

    2019-07-03_H1_OMCDCPDSUM_to_DARMIN1.xml

    
    Modified ETMY Spot Positions (-6.1mm PIT, +13.2mm YAW):
    2019-07-03_H1_SpotMove_6p1mmPitchOnly_TowardCenterOfOptic_DARM_OLGTF_LF_SS_5to1100Hz_15min.xml
    2019-07-03_H1_PCALY2DARMTF_SpotMove_6p1mmPitchOnly_TowardsCenterOfOptic_LF_SS_5t1100Hz_10min.xml

    Modified ETMY Spot Positions (-6.1mm PIT, +0.0mm YAW):
    2019-07-03_H1_SpotMove_0p0mmYaw6p1mmPitch_TowardCenterOfOptic_DARM_OLGTF_LF_SS_5to1100Hz_15min.xml
    2019-07-03_H1_PCALY2DARMTF_SpotMove_0p0mmYaw6p1mmPitch_TowardsCenterOfOptic_LF_SS_5t1100Hz_10min.xml

/ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O3/H1/Measurements/FullIFOActuationTFs/
    Nominal ETMY Spot Positions (-15.7mm PIT, +13.2mm YAW):
    2019-07-03_H1SUSETMX_L2_iEXC2DARM_12min.xml
    2019-07-03_H1SUSETMX_L2_PCAL2DARM_6min.xml
    2019-07-03_H1SUSETMX_L3_iEXC2DARM_12min.xml
    2019-07-03_H1SUSETMX_L3_PCAL2DARM_12min.xml

    Modified ETMY Spot Positions (-6.1mm PIT, +0.0mm YAW):
    2019-07-03_SpotMove_0p0mmYaw6p1mmPitch_H1SUSETMX_L2_iEXC2DARM_14min.xml
    2019-07-03_SpotMove_0p0mmYaw6p1mmPitch_H1SUSETMX_L2_PCAL2DARM_8min.xml
    2019-07-03_SpotMove_0p0mmYaw6p1mmPitch_H1SUSETMX_L3_iEXC2DARM_10min.xml
    2019-07-03_SpotMove_0p0mmYaw6p1mmPitch_H1SUSETMX_L3_PCAL2DARM_10min.xml

Further analysis on 
    - the spot-position move from the sensing function, 
    - the sensing function as measured by PCALX, and 
    - actuator measurements as a function of spots
to come after the holiday weekend.