The shift started with the ITF unlocked, and WE loops open; the closing of the loops took some time because one accelerometer was not working well. Valerio was able to fix the problem.
After that, at around 16:00, we started to lock with the aim to test the lock acquisition after the activity active common mode noise subtractor.
Unfortunately, we encountered two problems:
1 - lock of the cavity; fixed by Diego deactivating the IB automatic alignment.
2 - pass LOW_NOISE_2; after investigation, we discovered that the WE violin modes had been excited.
After some time we were able to dump them and to reach LOW_NOISE_3 at 19:52 UTC.
At 20:00 UTC started the commissioning activity ITF/TCS tuning; activity still in progress at the end of the shift.
IB left in drift control; IMC_AA red flag on DMS.
from 14:46 UTC to 15:56 the SWEB position loop has been open because the WE loops were open.
DOWNTIME EVENTS (time in UTC)
- from 15:00 to 16:00, ITF in troubleshooting, because one WE IP accelerometer was not working well; Valerio fixed the problem.
- from 17:00 to 19:37, ITF in troubleshooting (from 17:27), because the ITF was not able to pass LOW_NOISE_2 due to WE violin modes excited; Diego was able to dump them.