User name R. Michaels
Log entry time 11:13:19 on November 5,2004
Entry number 135921
This entry is a followup to: 135903
keyword=more on qasyHere is a follow-up on the charge asymmetry in run 4392 (an example).
The beam is unstable (fig 1) but we can still fit the asymmetry and
find the different monitors are consistent (fig 2), see table of
fitted results below.
I modified the "qasy" script in ~adaq/qasy (see README) so that
it looks for the ".0" file since the ".1" file is always very short.
If the experiment wants, I can work with the source group to
implement a feedback, it will keep qasy less than 10^-4. It may not
be necessary for DVCS but it's something I've been wanting to do
for the HRS DAQ for awhile now, so that it becomes a non-issue.
Results for Charge Asymmetries
error is the std dev in mean = rms/sqrt(N) which might be slightly
different from the Gaussian fit but should be close.
U3 Asy = -2155.54 +/- 41.3448 ppm
U10 Asy = -2174.47 +/- 43.5676 ppm
D3 Asy = -2207.81 +/- 42.5033 ppm
D10 Asy = -2167.11 +/- 41.1224 ppm
FIGURE 1
FIGURE 2
