camilla.compton@LIGO.ORG - posted 16:59, Monday 21 October 2024 - last comment - 17:28, Monday 21 October 2024(80804)
Automatic DARM Offset Steps
Elenna, Camilla
Ran the automatic DARM offset sweep via Elenna's instructions (took <15 minutes):
cd /ligo/gitcommon/labutils/darm_offset_step/ conda activate labutils python auto_darm_offset_step.pyDARM offset moves recorded to /ligo/gitcommon/labutils/darm_offset_step/data/darm_offset_steps_2024_Oct_21_23_37_44_UTC.txt
Reverted the attached tramp sdf diffs afterwards, see attached. Maybe the script needs to be adjusted to automatically do this.
I just ran Craig's script to analyze these results. The script fits a contrast defect of 0.742 mW using the 255.0 Hz data and 0.771 mW using the 410.3 Hz data. This value is lower than the previously 1 mW on July 11 (alog 79045), which matches up nicely with our reduced frequency noise since the OFI repair (alog 80596).
I attached the plots that the code generates.
This result then estimates that the homodyne angle is about 7 degrees.