QSK74 was flaky

[David Webber <dwebber@npl.uiuc.edu>]

Hi Peter (and Dave),

To answer your question, QSK74 was flaky during the run.  I don't know 
the dynamic range of the adjustments, but it started at about 1200 and 
was later set at 1000. We went so far as to set ODB alarms to watch the 
readback value.  In the future, we should tune the beam by the readback 
value and not the DAQ setting.

Some history plots:
http://ten.npl.uiuc.edu:8080/Fall2005/500

Minutes from elog 659:
Beam:
-QSK 74 has been adjusted twice when drifts were observed. Peter W. has 
called an expert to inform him.
-Sarah tried opening FS72 O/U to get more rate, but there were beam 
problems around the time she did the study so it should be tried again.
-We will add an alarm for QSK74 drifting too far.
-Lesson from QSK74 for next year: from now on when we do beam tuning we 
should use the readback value, not the demand value on magnets.

Best,
David