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Virgo Runs (O3)
conti, vardaro - 16:59 Tuesday 16 April 2019 (45657) Print this report
Comment to Operator report - morning shift (45650)

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.

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