The IMs and MCs have been burtrestored to the automatically generated snap file from monday 11/11 at 20:00
Attached are 10 min trends of the IMs osem signals in the euler basis (Long/Pitch/Yaw) during alignment on monday, and today after restoring the snapfile.
picture 1 : Monday 11/11 from 19:50 to 20:00 PT
picture 2 : Today 11/14 from 10:20 to 10:30 PT
No major shift is seen when comparing both trends
I've looked at the plots, and there is a huge shift of IM1, and shifts that are large on IM2 and IM4. The fact that I changed IM3 on Monday but it's not showing a change is troublesome.
IM1
Delta 800 pitch
Delta 50 yaw
IM2
Delta 115 pitch
Delta 10 yaw
IM3
Delta 0 pitch
Delta 0 yaw
IM4
Delta 70 pitch
Delta 0 yaw
The good alignment time is 5:09PST 11/11, or 1:09UTC 11/12.
To really be confident about your alignment now vs the alignment on Monday, you'll need to trend the alignment slider values, the alignment drive values, and the OSEM readings for 1:05-1:10UTC 11/12, and use that to compare the current IM positions.
[Cheryl Arnaud]
After talking with Cheryl, I attached, a more accurate comparison between two dates : monday 11/11 from 5pm to 6pm during good alignment and thursday during the night (11/15) from midnight to 1am (quieter environment) after the ISS work of thursday, with the restored alignment from monday.
screenshot 1 : position signals in um/urad in the euler basis monday
screenshot 2 : position signals in um/urad in the euler basis thursday night
screenshot 3 : alignment sliders values monday + volt monitor of 1 osem to prove signal is going through the actuation chain
screenshot 4 : alignment sliders values thursday night + volt monitor of 1 osem to prove signal is going through the actuation chain
We should worry if we were seeing a shif of the order of a mrad, which is far from being the case here.
IM1
delta of 80 (not 800) in pitch