(Travis, Betsy, Kissel)
After getting the handoff beam from the input HAMs, we double checked that the beam was centered on the ITMx. We then traced the beam and found it miscentered on the SR3 HR baffle (in front of SR3). Using the BS bias, we were able to roughly center the beam on SR3 - using ITMx bias didn't seem to drive the beam very much. We needed to use half of the BS YAW bias, however. Once centered, we looked at SR2 and found the beam within 1-2" centered on the optic (with 0 bias on SR3). We then used a bit of SR3 bias to roughly center on SR2. Heading over to SRM, we again found the beam within 1-2" from the center of the optic and centered it using some SR2 bias. We then verified that the beam (although blocked by a layer of First Contact on SRM-HR) sprayed through the OFI and out to HAM6. We suspect the OFI alignment "won't take much."
Notes:
We paused to recheck the ISI locking of HAM5 when we observed that the beam wobbled when we rested on the table. It seemed pretty locked, but the beam didn't seem to wiggle as much after we squeeked the lockers a bit more.
We increased the damping gains on the SR3 in order to help with the wobbling beam.
We started the realignment of the SR3 lower stage OSEMs.
Next up for HAM4:
Install TCS Temp Sensor Cable
SEI ISI Testing
FC Clean SR2
Chamber Closeout
Next up for HAM5:
Align all lower stage OSEMs on SR3 - a nasty task and will take a few hours, including checks of healthy SUS along the way
Pull FC on SRM (minor task)
OFI Alignment
OFI Res Testing
Install TCS Temp Sensor Cable
SEI ISI Testing
FC Clean SR3
Chamber Closeout
Biases as found noonish before we started using biases to align the output beam:
ITMx (why there was bias enabled is beyond me...) We zeroed this.
P = 38.7
Y = -48.9
PR3
P = -245.5
Y = 500.0
BS
P = 187.0
Y = -264.0
PR2
P = 0
Y = 1350
We accidentally forgot that we had lightly clamped the ITMx for other "parallel" tasks when we were aligning the SR optics last week. Hence, the realignment after unclamping it today.