Log entry time 23:25:18 on June12,2004

Entry number 125493

The conclusion of today's meeting was that we should collect
"production style" data overnight, but that this could be interrupted
if there was a good idea for a test on septum heating or to assure
data quality.  Also, Lisa would complete data taking to find a decent
running condition, and the beam modulation software would be exercised
to see if there was a new result after the recent beam tuning.

Hardly discussed at the meeting was an observation (by Hachemi, posted
in the haplog) that the regressed, normalized lumi widths were 
very large (>1000 ppm) for 30 uA He data.  No one at the meeting had
seen the data yet, but it is pretty shocking. The blumis are highly
correlated, and the widths are as high as reported.  Charge asymmetry
normalization appears to not be the culprit for the width, as the
bcm shows a width of less than 600 ppm.  In addition, the detector
signal (a width of around 2500 ppm) is also somewhat correlated with
the blumis.  Is this density fluctuations in the cold gas target?

The following tests have been run tonight to study the
detector widths:
- A current/raster scan with the He target.
- A current scan with a single foil carbon target, also one rastered 
run to check for odd systematics in the lumis.

A related test, which may shed some light on septum heating:
- A fixed current with each of 3 carbon targets with 
different foil spacings.

And, of course, Lisa will work on position differences and I'll try 
the beam modulation stuff one more time.

Other than that, I think, we sit at 30 uA on He with a 2x2 raster
and IA feedback on.