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User name paschke
Log entry time 13:45:50 on November 12, 2009
Entry number 299220
This entry is a followup to: 299218
keyword=phase advance
The phase advance is probably nothing to panic about yet, in my opinion. We need to look at
the width of the extracted correction slopes, from a slug of data or so. I think we are close to
what we had for HAPPEX-III, and unless we find something unusual, we should expect that the
HAPPEX-III performance would be good enough.
If we do need to change it, we should be able to make a clear estimate of how different
things will look when we change a quad. For H-III, I think we changed a couple of quads
(after the raster, I believe) something like 10%. Since the Hall A line is matched (it is now,
right?) then we should be able to know up front what this will do to intrinsic beam size,
and maybe we can actually plan our intervention this time. But again, we probably need
to look at some data for a while before we determine if and how much we need the results
to change.
A copy of this log entry has been emailed to: yqiang@jlab.org,dalton@jlab.org,xiaochao@jlab.org,rom@jlab.org,kkumar@physics.umass.edu, silwal@jlab.org