Jenne Drigger, Sheila Dwyer, Jennie Wright and Oli in chamber
The IMC guardian is now working when we put 3W into HAM1. Jenne held the output of MC2 M1 length drive, because that has not been working. We also edited the ISC_library is_locked(IMC function), by lowering the threshold used when the input power is above 2W. Since the IMC transmission has since improved it could probably be put back.
We engaged the WFS DOF1+2 which use MC refl WFS, and offloaded them. We then saw that we are well off center in MC2 trans P + Y, which were well centered on our reference time of 11:25 UTC Dec 3rd.
Jenne Driggers moved the IMs to match the top mass osems to the values from 89068. We also noticed that the whitening gain on IM4 trans was changed to 0Db (should be 18dB), making the power seem low in 89046.
| Dec3 | now | ||
| power into HAM1 | 2W | 3W (plus 30% loss on JM3) | |
| MC2 trans sum | 310 counts | 200-250 counts | 80% |
| IM4 trans NSUM (power into PRM) | 1.8W | fluctuating between 1W-3W | 1.45W expected |
| AS_C in single bounce | 3-4mW | 1.45*0.03*0.25*0.3 = 3.3mW into HAM6 | |
| IM4 trans pit | 0.23 | ||
| IM4 trans yaw | -0.04 |
Jennie and Oli are still working in chamber, so these numbers are still changing.
Olli and I went in and monitored IMC-MC2 YAW while changing the JM3 mirror in pitch, I loosened the locking screws for the pitvh adjustment to make it easier to move. Moving anti-lockwise in JM3 pitch moves down in yaw on the MC TRANS QPD due to the HAM1 periscope. We overshot a bit and had to correct the opposite way.
Every step I made we waited for the WFS to converge.
Every couple of steps we offloaded the WFS.
Then once we thought we couldn't get much closer we switched to adjusting YAW on JM3 to bring the MC2 TRANS pitch nearer to 0. The steps I made in yaw of JM3 didn't have as large an effect on MC2 TRANS as pitch so this was easier to tune.
I have included a plot showing our final values, 0.04 counts for yaw and 0.01 counts for pitch.