Reports until 17:04, Monday 08 April 2024
H1 ISC (SQZ)
jennifer.wright@LIGO.ORG - posted 17:04, Monday 08 April 2024 (77033)
Tuning CAM2 YAW offset makes build-ups better

Jennie W, Sheila, Ryan Short

 

After tuning the CAM1 PIT offset this morning and optimising the A2L gains after that, I tuned down the CAM2 YAW offset just before we went into observing. I chose this direction based on the overnight tests Camilla and I did. In the attached picture the cursor shows where the optimum offset is that improves the circulating arm powers. At each stage I had to wait about 2 minutes for the camera servo to bring the error point (IN1 channel) to the set-point.

The optimum value which increased the build-ups by about 6kW (OFFSET = -422) was set in the guardian (via updating the CAM YAW2 offset in userapps/isc/h1/guardian/lscparams.py) and accepted and monitored in SDF. I loaded the ISC_LOCK and CAMERA_SERVO guardians and made the SDF changes before we went into observing. We still need to optimise the A2L gains to match this change so the noise might not be better.

For reference I include a more comprehensive ndscope with all the channels I was monitoring as we did this.

Images attached to this report