Log entry time 19:10:34 on February20,2010

Entry number 309460

60 Hz noise is evident in the bpms... very evident.  Below, one sees a few 
events taken at 240 Hz in bpm1I04x... 4 events = 1 period. The peak-to-peak 
amplitude is about 50 micron.

The multiplets don't cancel, because an error was made in the intended fix so 
now the octets don't cancel 60Hz: +-+-+--+ and C.C.  The poor 60Hz cancellation 
is evident in the data... double peaked in both the pair and multiplet data.

The 4x multiplier for position differences (unlike asymmetries, the differences 
have no natural normalization) is really shocking.  First, the 60Hz noise gets 
ampliefied... due to the partial cancellation, the octets have peaks roughly 2x 
as far apart as the pairs.  But the actually mean of the helicity correlated 
changes are significant: 1.5 micron (pairs) in 1I02, and 6 micron (octets).  
This should be expected, but I honestly hadn't absorbed how we would enhance 
our ability to see these differences.