Opened SQZ fast shutter at 11:49 UTC. Then acted to select B1_PD2 for cc and AA loops:
- Acl commands:
Under SQZ_CC_Ctrl: 'Photodiode:Use B1_PD2_7MHz’
Under SQZ_SDB2: 'AA Phase:Use B1_PD2_7MHz’
- Init file of SQZ metatron node:
PD_select = 2
- ipython commands to /virgoDev /AEI SQZ/SQZ init.py:
SQZ_PLL_AA.B1_7MHz_mag.B1_PD1_7MHz_mag=0
SQZ_PLL_AA.B1_7MHz_mag.B1_PD2_7MHz_mag=2
(I did not change the config. file of SQZ_PLL_AA server to avoid reloading the server now; should be done e.g. at next maintenance)
Check of cc loop with gain 55, the loops behaves correctly.
Scan of cc phase (see attachment) with slow AA servo. Measured squeezing is around 2.7 dB.
Manual check of AA servo with dither lines, the loop behaves correctly. Set points of slow AA servo updated on Metatron init file.
Set point of slow cc phase loop updated to 0.1e-3
As the SQZ system works correctly with manual commands, I ask the metatron state LN3_SQZ at 14:12 UTC.
However the automation does not reach the final state, because the SQZ node keeps waiting for 7 MHz magnitude to reach the threshold (I realized that this threshold is still based on B1_PD1). In agreement with Matteo, to avoid sending the ITF in down for the moment I leave the SQZ metatron node in the state “Injecting squeezing”.
SQZ system is controlled properly.