jenne.driggers@LIGO.ORG - posted 14:28, Friday 20 March 2020 - last comment - 18:00, Friday 20 March 2020(55699)
Moving SR3 in observing
Starting at 14:15 Pacific I am moving SR3 in pitch in steps of 0.01, with several seconds of pause between each step. This is slow enough that it is okay to do in Observing. I'll update this alog or add a comment when I'm done.
To do this in observe, I unmonitored the SR3 opticalign sliders.
Earlier today during commissioning time I was trying to move faster, and killed the lock with a step of 1.0. At that time, I also had the DARM offset reduced to about 5pm, which makes it easier to see the change in junk light getting to the DCPDs.
All done for now. The farthest I got was about 465.5 on the SR3 pitch slider, which is a move of about 27 urad. I didn't move yaw at all. I'm sure I could have gone farther, but I don't really want to babysit it anymore tonight.
Patrick is running a script that will, with the same size / speed steps, move SR3 back to its nominal pit slider position of 438.4.
Perhaps on Monday I'll try either yaw, or more pitch, although so far I don't see any change at all, either in kappa_c or in the CFTD (compensated for cal changes over time) spectrum. The attachment shows spectra from earlier today and at the far position, and I can't tell the difference, although I'll look a little more closely on Monday morning.