Reports until 16:17, Wednesday 29 May 2019
H1 CAL (CAL, ISC)
jeffrey.kissel@LIGO.ORG - posted 16:17, Wednesday 29 May 2019 - last comment - 18:06, Wednesday 29 May 2019(49541)
Calibration Measurements Today: Sensing Functions In Nominal ISC Config, Some Data with More Centered ETMX Spot 
J. Driggers, J. Kissel

We've gathered some new data on the DARM loop both in support of regular check-ins on the calibration as well as in prep for a potential increase in IFO power tomorrow, and further investigations in to "L to A to L" coupling in the ISC control scheme:

Standard sensing function suite:
    /ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O3/H1/Measurements/FullIFOSensingTFs/
        2019-05-29_H1_DARM_OLGTF_LF_SS_5to1100Hz_15min.xml
        2019-05-29_H1_OMCDCPDSUM_to_DARMIN1.xml
        2019-05-29_H1_PCAL2DARMTF_BB.xml
        2019-05-29_H1_PCAL2DARMTF_LF_SS_5t1100Hz_10min.xml

Some incomplete data during the spot position move:
    /ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O3/H1/Measurements/FullIFOSensingTFs/
        2019-05-29_H1_PCAL2DARMTF_BB_postspotmove.xml
        2019-05-29_H1_DARM_OLGTF_LF_SS_5to1100Hz_15min_postspotmove.xml

Data analysis and results to come later.
Comments related to this report
jenne.driggers@LIGO.ORG - 18:06, Wednesday 29 May 2019 (49543)
Link

For this spot position move to investigate the L-to-ASC-to_L path, I moved the ETMX spot in pitch only, from -18.2mm (P2L gain of 4.85) to about -9.1mm (P2L gain of 2.85).  It seems that something in the ASC went unstable and caused the lockloss, although I'm not sure if that's because we were starting the second cal measurement at low frequencies, or if it would have rung up anyway while we sat for a few tens of minutes at this unusual spot position.