jeffrey.kissel@LIGO.ORG - posted 21:31, Thursday 28 February 2019 - last comment - 13:50, Wednesday 06 March 2019(47206)
Measured All Stages of ETMX Actuation Function
J. Kissel, S. Dwyer,
After Sheila fixed a few hiccups in the NLN_CAL_MEAS state's return to NOMINAL_LOW_NOISE in the ISC_LOCK guardian, I was able to gather all measurements necessary for updating the actuation function of the calibration. I was tuning the amplitude in sensing function's DARM OLG sweep to get better coherence between 5 - 20 Hz (to resolve detuning), aborted the measurement and we lost lock [it was a swept sine, and yes, it had a 3 sec ramp down time. I was actively watching the ASDs of ETMX digital requests to the DAC and we were no where close to saturating].
Anyways -- analysis to come, but the data lives here:
/ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O3/H1/Measurements/FullIFOActuationTFs/
2019-03-01_H1SUSETMX_L1_iEXC2DARM_25min.xml
2019-03-01_H1SUSETMX_L1_PCAL2DARM_8min.xml
2019-03-01_H1SUSETMX_L2_iEXC2DARM_17min.xml
2019-03-01_H1SUSETMX_L2_PCAL2DARM_8min.xml
2019-03-01_H1SUSETMX_L3_iEXC2DARM_8min.xml
2019-03-01_H1SUSETMX_L3_PCAL2DARM_8min.xml
Note that during these measurements, one *has* to turn of the Alignment Dither Loop system (namely DOFs 3 4 and 5), which controls the drift of the Y Arm (roughly equivalent to the SOFT DOF). With the loops OFF, the alignment does drift slowly, on a ~20 minute time-scale. As such, given the length of my measurements, I went back from NLN_CAL_MEAS to NOMINAL_LOW_NOISE in between clusters of measurements and waited there for the ADS error signals to steer back towards zero (which takes about 5 minutes), then switched back to NLN_CAL_MEAS and resumed measurements.
And although the data is meaningless, the amplitudes and frequency vectors in the sensing function templates
/ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O3/H1/Measurements/FullIFOSensingTFs/
2019-03-01_H1DARM_OLGTF_5to1100Hz_20min.xml
2019-03-01_H1_PCAL2DARM_TF_5t1100Hz_8min.xml
should be used for future measurements.
If you need it, my template for watching the ESD and Coil Driver DAC requests during measurement lives here
/ligo/home/jeffrey.kissel/Templates/DTT
H1ETMX_ActuatorSaturations.xml
Here're the DARM loop settings for the actuator during the time of this measurement. The filter file for ETMX is also attached. It's from the filter archive. There are several files around the time of the measurement (Data taken between 2019-03-01 02:55:17 [1235444135] and 2019-03-01 04:33:58 UTC [1235450056]), /opt/rtcds/lho/h1/chans/filter_archive/h1susetmx/ H1SUSETMX_1235362558.txt (translated -- Feb 28 2019 04:15:40 UTC) H1SUSETMX_1235500682.txt (translated -- Mar 01 2019 18:37:44 UTC) So the data should be covered by the Feb 28th filter file. That file has been copied over to the CAL group's filter archive, for easy access, /ligo/svncommon/CalSVN/aligocalibration/trunk/Common/H1CalFilterArchive/h1susetmx/ H1SUSETMX_1235362558.txt