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User name brads
Log entry time 23:49:19 on October 31, 2008
Entry number 245762
keyword=Very slight downward bow to optics target -- Holey C, BeO center BPM values may change(?)JP observed a very slight bowing of the optic foil target. Earlier in the day he was sure it was bowing up in the middle. An upward bow would be consistent with the small vertical centering discrepancy between the BeO target and the holey carbon.
When we went down in the evening to take a photo we found it was bowing very slightly down in the middle (see gap between ruler and optics bed at right). Perhaps the target frame shifted a little (due to jostling during target work)?
Probably nothing to worry about given the small shift, but it will be
interesting to see if the BeO and Holey C beam centroid positions changed
at all.
Figure 1
Figure 2
