In looking at HAM2 optics, I noticed that all three IMC optics, MC1, MC2, and MC3 have alignment changes from before to after Mantenance yesterday.
change in alignment | ||
MC1 P | +25 | urad |
MC1 Y | +20 | urad |
MC2 P | +3 | urad |
MC2 Y | +3 | urad |
MC3 P | -44 | urad |
MC3 Y | +15 | urad |
Sliders did change, however I can see where the old safe.snap alignment offsets were loaded, and then corrected, for MC1 and MC3. MC2 is odd because I don't see where the safe.snap alignments was loaded since it's alignment offsets are not seen on MC2 in the same time frame. I started my plot at 6/28 at 15:00UTC which is 8AM local, when Maintenance starts.
IM4 Trans pitch and yaw also changed by 0.02 (+ for pitch, - for yaw).
DAC cards were changed for MC1 and MC3 yesterday, so this is a plausable expalnation for the large change in MC1 and MC3 OSEM readouts - electronic offset changes.
MC2 DAC card was not swapped, and it's OSEMs show a change of pitch and yaw of 3urad, and the IMC is stably locked, and IM4 Trans shows only a small change, so that suggests that MC1 and MC3 pitch and yaw alignments changed by much less than the 25-44urad seen on the OSEM readouts.
IM4 Trans shows some alignment change of 0.02 on pitch and yaw, so this is noticable but much smaller than a 0.1 change that would warent more investigation.