Log entry time 15:32:16 on June19,2004

Entry number 126328

For IHWP insertion (the first one since the spot move) I did a quick
PITA scan.  Well, I did two, but there was no beam for all but
one point in the first one (Run 2282, which is just junk).

Dithering OFF, Charge Feedback OFF. IA cell to 5V.

*** Moved RHWP to 6500 ***

I put the PC voltages to the PC voltages which I _think_ represent
the best circular polarization from the PC (I had trouble figuring
out from previous log entries if this was correct).

Run 2283.
 Delta    Pos    Neg   
  300    8.837   1.752 
  200    7.170   3.419
  100    5.504   5.085
    0    3.837   6.752
 -100    2.170   8.419

The slope was 13.24 ppm/Volt, and the offset at 0V was 65 ppm.  From
this, I set new PC voltages:

For IHWP=IN, RHWP=6500  => PC Pos = 3.755, PC Neg = 6.834

To back out of the calibration, I turned feedback and dithering
back on.  Early results from Run 2284 suggest the IA cell is working
harder than it should, so I need to modify the PC voltages again after
this run.