jeffrey.kissel@LIGO.ORG - posted 15:24, Wednesday 20 November 2019 - last comment - 15:33, Wednesday 20 November 2019(53392)
Calibration Measurements: Sensing Function Suite, plus looking for UIM modes above 50 Hz
V. Bossilkov, J. Kissel We grabbed standard measurements of the sensing function today, in order to continue the exploration of the time dependence in the low frequency response (due to the mixing of a detuned SRC and parasitic angular loop coupling). Also, we took some time to characterize the high frequency response of the UIM, because -- even though we know that these dynamics are non-f^6 (see LHO aLOG 38295) -- we've not remeasured this after we replaced the test masses between O2 and O3. The data has been committed to the CalSVN here: /ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O3/H1/Measurements/FullIFOSensingTFs/ 2019-11-20_H1_DARM_OLGTF_LF_SS_5to1100Hz_15min.xml 2019-11-20_H1_PCALX2DARMTF_LF_SS_5t1100Hz_10min.xml 2019-11-20_H1_PCALY2DARMTF_LF_SS_5t1100Hz_10min.xml 2019-11-20_H1_PCALX2DARMTF_BB_3min.xml 2019-11-20_H1_PCALY2DARMTF_BB_3min.xml /ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O3/H1/Measurements/FullIFOActuationTFs/ Real, new, good data: 2019-11-20_H1SUSETMX_L1_iEXC2DARM_HFDynamicsTest_200-600Hz.xml 2019-11-20_H1SUSETMX_L1_iEXC2DARM_HFDynamicsTest_30-100Hz.xml 2019-11-20_H1SUSETMX_L1_iEXC2DARM_HFDynamicsTest_90-250Hz.xml 2019-11-20_H1SUSETMX_L1_PCAL2DARM_HFDynamicsTest_200-600Hz.xml 2019-11-20_H1SUSETMX_L1_PCAL2DARM_HFDynamicsTest_30-100Hz.xml 2019-11-20_H1SUSETMX_L1_PCAL2DARM_HFDynamicsTest_90-250Hz.xml Dummy templates that are still under development: 2019-11-20_H1SUSETMX_L1_PCAL2DARM_HFDynamicsTest_30-500Hz.xml 2019-11-20_H1SUSETMX_L1_iEXC2DARM_HFDynamicsTest_25-700Hz_SweptSine.xml 2019-11-20_H1SUSETMX_L1_iEXC2DARM_HFDynamicsTest_30-500Hz.xml Processed data, analysis, and conclusions to come.
This is an added note mostly for DetChar.
In todays calibration time, we were driving the top stage (UIM) of the ETMX quad stack, to better image features of the top stage dyanmics that we can see through DARM (which appear between 44 Hz and ~460Hz). We still have more data to gather, and then do fitting with iirrational for better TF models in the moderately near future.
DetChar: This is a note that as of 3pm local time (11 pm UTC): The ~500Hz violin mode will have been strongly excited by our activty, as we were performing broadband injections at the top stage from 30 to 600 Hz.