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AdV-SGD (FDS commissioning)
vardaro, vahlbruch, zendri - 19:48 Thursday 15 January 2026 (68496) Print this report
Recovery of SQZ: first part

After the recovery of PLLs. Henning managed to relock the squeezer with a MZ offset of 0V. I.e. a parametric gain of 2.8 and 8.8dB of generated SQZ. In this moment we are not able to generate more than 9dB of squeezing but it is already a good value for the optimization of the system.

After that we switched on the hardware below EQB1 in order to be able to move everything also from remote.

We controlled again also the SQB1 suspended bench

Finally we aligned the HD detector with the squeezed light reflected by the retroreflector. We measured 7.9dB of AntiSqueezing and 5.6 dB of squeezing. These value are slightly lower respect what we had in september 2022 https://logbook.virgo-gw.eu/virgo/?r=57124

In the next shift we will do the fine tuning of everything starting from the delay line. 

At the end of the activity we unlocked the 1064nm mode cleaner and closed all the shutter. We left the EQB1 stepper motor driver on.

 

Comments to this report:
zendri, toffano, vardaro - 20:16 Thursday 15 January 2026 (68498) Print this report

After an inspection of the Det EE room, we found that the DDS5 generator was off. This was due to its internal power supply being damaged.  Consequently, since the DDSs are connected in series to the external Wenzell clock, all the downstream DDSs were without a frequency reference.

After replacing the power supply and resetting DDS5, all the PLLs started working again. This started around 2:00 PM local time.

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