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Virgo Runs (C8)
swinkels - 11:15 Monday 08 May 2017 (37492) Print this report
Correlations
I did a brute-force search for correlation between the various new ranges and several other interesting channels (B4/B1p_DC, B4_12/112MHz_mag), for the five hour lock stretch during the early hours of Saturday. Full table of results is attached, with some interesting channels marked by hand. I am cleaning up the script for finding the correlations, so that it can be used by others.

The channels CAL_RANGE_NSNS, CAL_RANGE_10x10 and CAL_RANGE_30x30 all correlate strongly with SDB2_B1p_QD2_V_6MHz_Q, SDB2_B1s2_Cam_PosY and a bunch of similar channels, which might indicate some dependence on a fluctuations in TX of some mirrors. See fig 1 for a typical correlation. Fig 2 shows that the correlation seems not that obvious when looking in the time domain, even though the correlation is significant.

For the DC and sideband powers, it is harder to find interesting channels, since they correlate with a lot of other DC powers. For B1p_DC, it seems that again V1:SDB2_B1p_QD2_V_6MHz_Q_mean is among the most interesting channels, while for the B4_DC and sideband powers also SPRB_B4_QD1_H seems of interest. Also some channels related to the local control of SDB1 show up, this might be due to the drift control following the beam.
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