Log entry time 00:05:33 on July26,2004

Entry number 129712

Took two scans designed to generate large charge asymmetry, in order
to better test detector non-linearity.  Most methods for generating
charge asymmetry also generates position differences, but we'll have
to live with that.

Each scan covered approximately 1/2 oscillation (peak-to-trough) of
the 4-theta term in the halfwave scan.  A PITA offset delta = -100 V
was used to turn this into a significant charge asymmetry change.
This was done for each halfwave plate state in order to balance 
positive and negative charge asymmetries (a somewhat arbitrary 
choice).  The IA cell was set to 5 V.  Hall C feedback was off, of course, the 
their asymmetry was roughly zeroed.

The auto_rhwp macro was used, with steps of 5 degrees and 180 sec per point.  
Scan clean will point to good data at stable set points.

Run 3151: IHWP IN, RHWP scan [48,93], PC Pos = 4.426, Neg = 7.871
Run 3152: IHWP OUT, RHWP scan [93,48], PC Pos = 3.935, Neg = 8.276