Log entry time 11:51:01 on July10,2004

Entry number 128113

Concluded source study in the injector (access was required to Hall A, so no 
beam past 45 MeV).

We performed RHWP scans with and without  "Delta" offsets for both IHWP states.
 
We were able to find running positions for both IHWP states that provide 
reasonably small position differences while also zeroing the charge asymmetry.  
A closer look at the data we've collected will provide more specific and 
reliable indication of the sources of position differences. A preliminary 
inspection suggests involvement
from a significant analyzing power gradient and possibly a polarization 
gradient on the beam incident to the Pockels cell (as well as the usual 
birefringence gradients).  The problems don't appear to be conspiring against 
us, so we're pretty happy.

IA slope was also taken.  The slope dropped by 40% during the gun change.   A 
coupling of about 1.2 nm/ppm in some bpms was observed; this is a little more 
position difference coupling than we like. Increasing the IA slope might help 
us with this; we'll play with the picomotor soon.