Today I unlocked the squeezer controls (internal and SC PLLs, SHG, OPA P-pol, and MC1064 LO servos) and I changed the crystal temperature of the main laser in the AEI squeezer to look for the beat note with the Virgo laser. The original set point for the three SVS PLLs is shown in the first attachment. The DAC outputs for thermal controls and corresponding crystal temperatures were:

- main laser: 32750 (29.87 deg)

- cc laser: 40146 (34.02 deg)

- sc laser: 32535 (31.09 deg)

I found the beat note for external PLL after decreasing the main SQZ laser temperature by about 1.5 deg. Then I applied a similar change to the CC and SC lasers to bring the corresponding beat notes around the working proper RF values, and I finally engaged all of the three PLLs, see second attachment. The DAC outputs for thermal controls and corresponding crystal temperatures at the new working point are:

- main laser: 26140 (28.23 deg)

- cc laser: 34105 (32.45 deg)

- sc laser: 26920 (30.26 deg)

I noticed that the  SC PLL is oscillating at the current settings of the PLL, so I decreased the charge pump gain from 6 to 2 and the loop become stable.