Figure 1 shows the data in DC read-out from Friday. The CMRF (coupling of SSFS/FMOD lines to DARM), varies around zero, with maybe an offset that is a factor few smaller than the fluctuations. Looking at the spectra of the coupling. There is a visible bump at 6mHz in the coupling. It would be interesting to understand what is fluctuating at that frequency, and try to improve it to make the CMRF more stable in time. Less clearly, but the DARM optical gain also seem to fluctuate at that frequency.
Francesco Di Renzo has worked on making the MONET bilinear analysis more accessible. It is sufficiently simple and well documented to start using it under one hour of learning time. Although the output is still a bit hard to navigate, and relies in many ways on reading a text file.
Analyzing the 1111Hz line, the dominant reason for coupling fluctuations are:
Figure 2 COMMp TX below 250mHz
Figure 3 DIFFp TX between 250mHz and 1Hz
Figure 4 shows all of the bilinear coupling that the analysis is able to explain based on the following channels tried for blinear coupling of 1111Hz x other channel:
V1:ASC_BS_TX
V1:ASC_COMMp_TX
V1:ASC_DIFFp_TX
V1:ASC_PR_TX
V1:ASC_SR_TX
V1:ASC_PR_X_CORR
V1:SDB2_B5_QD2_H
V1:Sc_NI_MIR_X_AA
V1:Sc_NE_MIR_X_AA
V1:Sc_WI_MIR_X_AA
V1:Sc_WE_MIR_X_AA
V1:Sc_BS_MIR_TX_AA
V1:Sc_PR_MIR_X_AA
V1:ASC_BS_TY
V1:ASC_COMMp_TY
V1:ASC_DIFFp_TY
V1:ASC_PR_TY
V1:ASC_SR_TY
V1:ASC_PR_Y_CORR
V1:SDB2_B5_QD2_V
V1:Sc_NI_MIR_Y_AA
V1:Sc_NE_MIR_Y_AA
V1:Sc_WI_MIR_Y_AA
V1:Sc_WE_MIR_Y_AA
V1:Sc_BS_MIR_TY_AA
V1:Sc_PR_MIR_Y_AA
V1:LSC_DARM
V1:LSC_PRCL
V1:LSC_MICH
V1:LSC_SRCL
V1:SDB1_OMC1_err
Figure 5 just confirms the result of MONET using simple coherence between COMMp/DIFFp TX and the LSC_DARM_SSFS_LINE channels. In partiuclar the 6mHz is well visible on COMMp_TX, and coherent.