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User name Higinbotham
Log entry time 05:52:22 on September 05, 2009
Entry number 288099
This entry is a followup to: 288006
keyword=Shifts of Target Ladder
The previous position was done when the target was warm, but under vacuum
and check by turned raster on and off and seeing the scaler rates drop.
At the mm level, each transition (1 atm -> vacuum & vacuum ->
cryo-target) can cause shifts and we have cryo-cycled the target several
times (not that we want to).
Dave Meekins has noted that the vacuum loading shift is often balanced
back during the cool-down of target. Not sure what happens if you
re-cool the target several times.
Anyway, it will be good to watch this. Especially it the target warms up
again.