At GPS = 1239456611 we performed a CC phase scan to optimize the squeezing level (length = 780s). The plot of the phase scan is shown in the attached Figure. The distance between the minimum of the magnitude and the best squeezing level is -0.61 rad. With the scan we found -2.8 dB of squeezing and 5.3 dB of anti-squeezing.
The CC phase that maximize the squeezing is 0.21 rad and the slow CC loop set point is 0.6e-3 V.
Before the tuning the optimal squeezing phase was 0.54 rad and the slow CC loop set point was 0.15e-3 V. Thus before the optimization -2.2dB of squeezing were injected.