JeffreyK, SudarshanK, DarkhanT
Today we took DARM open-loop transfer function measurement using twice stronger drive at higher frequencies, > 1000 Hz, compared to measurement taken last night (see LHO alog #20585). We will need to bump up drive level a little bit more at higher frequencies to get a better coherence in the future measurements.
We also took PCALY sweep with the same frequency vector that started 10-15 minutes after starting DARM sweep.
Since these two measurements were taken close in time and within the same lock stretch we assume that IFO parameters were the same in both measurements. We will try to use both sweeps to estimate DARM parameters.
DARM measurement XML file was committed to SVN:
CalSVN/aligocalibration/trunk/Runs/ER8/H1/Measurements/DARMOLGTFs/2015-08-17_H1_DARM_OLGTF.xml
PCALX and PCALY measurements' XML files were committed to SVN:
CalSVN/aligocalibration/trunk/Runs/ER8/H1/Measurements/PCAL/2015-08-17_PCALX2DARMTF_logscale.xml
CalSVN/aligocalibration/trunk/Runs/ER8/H1/Measurements/PCAL/2015-08-17_PCALY2DARMTF_logscale.xml
We did a follow up measurement down to ~25 Hz with adjusted envelope that gave us a slightly higher coherence at high frequencies, [600 .. 900] Hz.
This measurement XML file was committed to SVN:
CalSVN/aligocalibration/trunk/Runs/ER8/H1/Measurements/DARMOLGTFs/2015-08-17_H1_DARM_OLGTF_downTo25Hz.xml
The adjusted envelope with references from both DARM TF measurements were saved in a template:
CalSVN/aligocalibration/trunk/Runs/ER8/H1/Measurements/DARMOLGTFs/2015-08-17_H1_DARM_OLGTFtemplate.xml
