Keeping fixed the powers of the NI DAS (NI IN:310 mW, NI OUT:2.25 W), we changed the WI power values:
10.35 UTC : WI IN: 80 mW-> 130 mW
WI OUT: 300 mW -> 17 mW
After the CP thermalization, Paolo and Diego closed the BS in the full bandwidth and they changed the alignment offeset to find a good compromise between the sidebands and the dark fringe.
In attachment you can find the comparison of B1p, B4_112MHz and CMRF between today (42Mpc-blue curves) and April 30th (50 Mpc-red curves):
-today the sidebands are higher;
-the CMRF is better;
-the B1p is the same,
but we are not able to recover 50 Mpc.
Thus it seems that the lack of Mpc is not related to the alignment working point.
Food for thoughts: comparison of the sensitivity curves is also attached (figure 2).
After the TCS/Alignment work the ITF optical gain dropped, and the squeezer performance is lower. It would be good to check the OMC alignment and mode match, as the SDB1 alignment drift control is done in only 2 out of the 4 degrees of freedom.
