camilla.compton@LIGO.ORG - posted 12:24, Monday 08 January 2024 - last comment - 08:58, Thursday 11 January 2024(75250)
Attempted to change ADF frequency at 20:05UTC - Unsure of Issue so Reverted
We've been seeing SQZ angle not optimizing correctly (75245, 75151). At 20:05 Ibrahim took us into commissioning and I tried to change ADF frequency H1:SQZ-ADF_VCXO_FREQ_SET from 1300Hz to 200Hz. The ADF line didn't move from the 1300Hz region, just became noisy when I changed it. PLL didn't lock. Unsure why the ADF wouldn't move, I also tried 800Hz to no avail. ADF frequency hasn't successfully been changed since Daniel adjusted the model in May 69453.
At ~16:15UTC when we got to NLN, I tried and failed at this again.
Vicky showed (image) that H1:SQZ-ADF_VCXO_CONTROLS_SETFREQUENCYOFFSET and H1:SQZ-ADF_VCXO_FREQ_SET need to be changed then the ADF successfully moved. I also turned the size of the line down by turning up H1:SQZ-RLF_INTEGRATION_ADFATTENUATE, but it was still big and probably reduced our range a few MPc. Attached settings changed and then reverted.
It didn't seem to be able to converge on zero, plot attached. After trying twice I reverted the changes.
Dhruva points out to correctly change both of these settings we can use the script in /sqz/h1/scripts/ADF/ 'python setADF.py -f newfrequency'