Jefferson Lab Alignment Group
DATA TRANSMITTAL
TO: Jack Segal DATE: 30 Mar 1999
FROM: Jim Dahlberg Checked: # : 510
DETAILS:
Below are the results of the recent survey performed on the Hall A VDC chambers.
The values are in millimeters and represent the relative movement of each chamber
after the supports were changed out. A (+Y) value indicates a rise, and a (–X) value
indicates a shift to the beam right.
LOCATION D Z D X D Y
HADRON
Upstream beam left 0.0 -0.05 +0.02
Upstream beam right 0.0 -0.05 +0.04
Downstream beam left 0.0 +0.20 -0.02
Downstream beam right 0.0 +0.20 +0.05
ELECTRON
Upstream beam left 0.0 -0.22 +0.08
Upstream beam right 0.0 -0.22 +0.18
Downstream beam left 0.0 -0.17 -0.02
Downstream beam right 0.0 -0.17 +0.17